I think it is a bad idea, uploading your own. We don't want people that upload a picture that is not suitable for little kids now would we? You know what I mean with that. I think, how it is right now, is good enough. Though I agree with the armatars in games, they can be nice, take Enigmata Genus Revenge for example. On Kongregate is it allowed to put a avatar from the game on your profile. Such could be possible, but yet again, it is just a idea.
