Brilliant. About "little big planet"... wonder if I am able enough to make a Buzzerbeater level... hmm... PS3's Home could also be an arena, but I guess it is only for PS3 games (Don't know it so well). The face application is here on the forums somewhere. I'll look for it in my BBgame's halftime. Absolutely great idea!
Combining the faceapplication with choices for position, choose background colors, fill in team name and when you consider yourself done, you get your players trading card. It could even go further... when viewing your players card you can get an option to sign up for the team name you just created and one of your starting players is that player as one of the youngest, with the mentioned position ;) Woohoo! Get it done now. I think it will get BB a major rush of users for sure.