I assume you never used steam in the last years? Games drop avatars as items for steam inventory, and you can trade them and put them in special slots, they are

I assume you never used steam in the last years? Games drop avatars as items for steam inventory, and you can trade them and put them in special slots, they aren't just random images, its not just avatars its also frames of avatars, slots of stuff to show on profile, animated backgrounds etc.