We do have this, you can submit your created ones each season and then Carlie decides if it goes in. If you subit a game you dont. You also can can import your own game if its entirely yours. Amrators you can't.
You earn a certain group of armatars every time you hit a specific amount of AP(Armor Points). That's the only way, and Carlie sometimes makes a season contest based on one of these seasons(thanksgiving, Halloween, spring, summer, etc.) for any user to submit they're own armatars for other AG users to use temporally or until next season without changing.
Hmm. It would be better, if we could freely upload are own armatars... We wouldn't have to keep the same styled armatars anymore. Char has a own armatar! Mh.