I think “streets paved with gold” comes from Revelation - specifically, Revelation 21:21, “And the twelve gates were twelve pearls; every several gate was of one pearl: and the street of the city was pure gold, as it were transparent glass.”
If possessed-Rarity got the idea to pave the streets with gold, does this mean the book of Revelation exists in Equestria? :p
If possessed-Rarity got the idea to pave the streets with gold, does this mean the book of Revelation exists in Equestria? :p