I'm talking about games like Metroid, Final Fantasy, Elder Scrolls, Ico, Okami, Legend of Zelda, Shadow of Colossus and Metal Gear Solid. Games of beauty and artistry.
The reason why I think Rarigamer is a great concept is because of what it represents. Rarity could represent an underrepresented part of video games: the art of video games. To Rarity, games would be a way to experience somepony's creative vision not just a way of killing time.
So that's my idea for possible art. (And if you make her play a multiplayer game, please don't make her use her magic to cheat. It's an old joke and it makes her look like an ass.)