LightningBolt
Umbrella - For Patreon supporters
Lightning Dee - Derpi Supporter
Verified Pegasus - Show us your gorgeous wings!
Preenhub - We all know what you were up to this evening~
Philomena - For helping others attend the 2021 community collab
Twinkling Balloon - Took part in the 2021 community collab.
Ten years of changes - Celebrated the 10th anniversary of MLP:FiM!
My Little Pony - 1992 Edition
Best Art Program Ever - For artists who were courageous enough to draw something for the April Fools day.
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab

Moderator
Undead inside
@bluemeganium
The Lightning/Medley mane is one of the defaults in the new avatars, if that helps at all.
bluemeganium
In the Background - Background ponies need love too!
Charitable Contributor - Contributed to a series of art packs that helped raise over $10,000 for charity
Dream Come True! - Participated in the MLP 9th Anniversary Event
A Really Classy Artist - 250+ images under their artist tag
Birthday Cake - Celebrated MLP's 7th birthday
An Artist Who Rocks - 100+ images under their artist tag
Flexible - Bendy Pony
Artist -

bg pony nymphomaniac
Now I need to make my very own Sprinkle Medley silhouette. 24/7 always the right colos.
Watermelon Changeling
Verified Pegasus - Show us your gorgeous wings!
Preenhub - We all know what you were up to this evening~
My Little Pony - 1992 Edition
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
Dream Come True! - Participated in the MLP 9th Anniversary Event
Wallet After Summer Sale -
Notoriously Divine Tagger - Consistently uploads images above and beyond the minimum tag requirements. And/or additionally, bringing over the original description from the source if the image has one. Does NOT apply to the uploader adding several to a dozen tags after originally uploading with minimum to bare tagging.
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends
A Tale For The Ages - Celebrated MLP's 35th Anniversary and FiM's 8th Anniversary
Friendship, Art, and Magic (2018) - Celebrated Derpibooru's six year anniversary with friends.

ドドドド
F
Loira
Birthday Cake - Celebrated MLP's 7th birthday
Perfect Pony Plot Provider - Uploader of 10+ images with 350 upvotes or more (Questionable/Explicit)
Happy Derpy! -
Flexible -
Platinum bit -
Ruby -
Best Artist - Providing quality, Derpibooru exclusive artwork
Artist -

Smolder is a cutie
Farewell cutie, we shall hold you in our hearts and memories ❤️
xn
The Power of Love - Given to a publicly verified artist with an image under their artist’s tag that has reached 1000 upvotes
An Artist Who Rocks - 100+ images under their artist tag
Artist -
The End wasn't The End - Found a new home after the great exodus of 2012

Mega Cyberforce
Never forget.
I don't like new randomly choosed fixed avatar, but it made to create a custom one which fits the style
PoneWithAFairlyLongName
Equality - In our state, we do not stand out.
Friendship, Art, and Magic (2017) - Celebrated Derpibooru's five year anniversary with friends.

Haha, now I'm just a background pony again!
Background Pony #E9E6
wieners and such
Background Pony #2513
@Joey
Only for users with nicknames :P. BPs can't physically have more than 65536 combinations (if you use nickname hash as a seed, of course.).
Watermelon Changeling
Verified Pegasus - Show us your gorgeous wings!
Preenhub - We all know what you were up to this evening~
My Little Pony - 1992 Edition
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
Dream Come True! - Participated in the MLP 9th Anniversary Event
Wallet After Summer Sale -
Notoriously Divine Tagger - Consistently uploads images above and beyond the minimum tag requirements. And/or additionally, bringing over the original description from the source if the image has one. Does NOT apply to the uploader adding several to a dozen tags after originally uploading with minimum to bare tagging.
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends
A Tale For The Ages - Celebrated MLP's 35th Anniversary and FiM's 8th Anniversary
Friendship, Art, and Magic (2018) - Celebrated Derpibooru's six year anniversary with friends.

ドドドド
@Joey
4,536T combinations? That's a lot for collecting them all, man.
ZippySqrl
HARD WERK - Merited Perfect Pony Plot Provider badge with only their own art and really hates Applejack
Preenhub - We all know what you were up to this evening~
Twinkling Balloon - Took part in the 2021 community collab.
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Lady's Wink -
Toola Roola - For helping others attend the 2019 Community Collab
Wallet After Summer Sale -
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends
A Tale For The Ages - Celebrated MLP's 35th Anniversary and FiM's 8th Anniversary

Tired Artist
@Joey
>no alicorns
Joey
Dawnsong - Derpi Supporter
Verified Pegasus - Show us your gorgeous wings!
Preenhub - We all know what you were up to this evening~
Philomena - For helping others attend the 2021 community collab
Twinkling Balloon - Took part in the 2021 community collab.
Ten years of changes - Celebrated the 10th anniversary of MLP:FiM!
My Little Pony - 1992 Edition
Best Art Program Ever - For artists who were courageous enough to draw something for the April Fools day.
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab

PM me your cute OCs
@Background Pony #8DFD
8,290,688 possible body colors
8,290,688 possible mane colors
3 species
22 mane styles

4,536,543,495,880,704 possible combinations. Collect them all.
Background Pony #50E6
I kinda liked how the old one, even though I guess it's Lyra's silhouette, was ambiguous enough that it could be a filly or foal, where the new random ones are definitely all* mares.

*Well, to be truthful, I can't swear to have seen all possible combinations.
Joey
Dawnsong - Derpi Supporter
Verified Pegasus - Show us your gorgeous wings!
Preenhub - We all know what you were up to this evening~
Philomena - For helping others attend the 2021 community collab
Twinkling Balloon - Took part in the 2021 community collab.
Ten years of changes - Celebrated the 10th anniversary of MLP:FiM!
My Little Pony - 1992 Edition
Best Art Program Ever - For artists who were courageous enough to draw something for the April Fools day.
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab

PM me your cute OCs
@zippysqrl
That's why the new ones face right (that was actually DoublePipe's idea) — they're facing the comments so they look like they're talking.

As for the old one? No clue.
ZippySqrl
HARD WERK - Merited Perfect Pony Plot Provider badge with only their own art and really hates Applejack
Preenhub - We all know what you were up to this evening~
Twinkling Balloon - Took part in the 2021 community collab.
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Lady's Wink -
Toola Roola - For helping others attend the 2019 Community Collab
Wallet After Summer Sale -
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends
A Tale For The Ages - Celebrated MLP's 35th Anniversary and FiM's 8th Anniversary

Tired Artist
What I don't get is why this one faces left?
I make it a habit to have my avatar face the comment, which is usually to the right.
Background Pony #239A
@zippysqrl
I don't know who'd want to do that though when they could get their own randomly assigned OC waifu instead :D
ZippySqrl
HARD WERK - Merited Perfect Pony Plot Provider badge with only their own art and really hates Applejack
Preenhub - We all know what you were up to this evening~
Twinkling Balloon - Took part in the 2021 community collab.
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Lady's Wink -
Toola Roola - For helping others attend the 2019 Community Collab
Wallet After Summer Sale -
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends
A Tale For The Ages - Celebrated MLP's 35th Anniversary and FiM's 8th Anniversary

Tired Artist
"for some reason"
You mean to use as an actual avatar and replace the new ones.
Chicago Ted
Magical Inkwell - Wrote MLP fanfiction consisting of at least around 1.5k words, and has a verified link to the platform of their choice
Speaking Fancy - Badge given to members that help with translations

Resident Linguist
F
Joey
Dawnsong - Derpi Supporter
Verified Pegasus - Show us your gorgeous wings!
Preenhub - We all know what you were up to this evening~
Philomena - For helping others attend the 2021 community collab
Twinkling Balloon - Took part in the 2021 community collab.
Ten years of changes - Celebrated the 10th anniversary of MLP:FiM!
My Little Pony - 1992 Edition
Best Art Program Ever - For artists who were courageous enough to draw something for the April Fools day.
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab

PM me your cute OCs
It's worth noting too that this wasn't exactly the original default either. It was initially a 125x125 PNG file. The SVG version was added about a year ago.
Starry Mind
My Little Pony - 1992 Edition
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
Wallet After Summer Sale -
Artist -
Not a Llama - Happy April Fools Day!

Take pride. 🌈
F
Sprite
Ten years of changes - Celebrated the 10th anniversary of MLP:FiM!
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
Dream Come True! - Participated in the MLP 9th Anniversary Event
Wallet After Summer Sale -
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends
A Tale For The Ages - Celebrated MLP's 35th Anniversary and FiM's 8th Anniversary
A Really Classy Artist - 250+ images under their artist tag
Friendship, Art, and Magic (2018) - Celebrated Derpibooru's six year anniversary with friends.
Birthday Cake - Celebrated MLP's 7th birthday

That One Shitty Artist
F
Soda Fizz
Artist -

Why am I here?
Reap In Pisces old avatar
wenni
HARD WERK - Merited Perfect Pony Plot Provider badge with only their own art and really hates Applejack
Verified Pegasus - Show us your gorgeous wings!
Preenhub - We all know what you were up to this evening~
Philomena - For helping others attend the 2021 community collab
Twinkling Balloon - Took part in the 2021 community collab.
My Little Pony - 1992 Edition
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
Charitable Contributor - Contributed to a series of art packs that helped raise over $10,000 for charity
Dream Come True! - Participated in the MLP 9th Anniversary Event

Pit Lord
f
SourGummiWyrm

2015 Pony Avatar
#RISEAGAINST
Joey
Dawnsong - Derpi Supporter
Verified Pegasus - Show us your gorgeous wings!
Preenhub - We all know what you were up to this evening~
Philomena - For helping others attend the 2021 community collab
Twinkling Balloon - Took part in the 2021 community collab.
Ten years of changes - Celebrated the 10th anniversary of MLP:FiM!
My Little Pony - 1992 Edition
Best Art Program Ever - For artists who were courageous enough to draw something for the April Fools day.
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab

PM me your cute OCs
Fine, I'll just post the SVG :P
Thanotos Omega
Wallet After Summer Sale -
Not a Llama - Happy April Fools Day!

They/Them if you please,
(v;-;)