There are several games where you can use your avatar. Check out the "Games" section, and find "Avatar gamers" (no not the movie game Avatar, but rather games made to use your avatar in).
There are a few card games, likes Spades, Hearts, and Poker. As well there is a Pirate game. "Booty" is in the title, though I can't recall it's full name.
I still consider "Keflings" as the king of these avatar games so far. I'm fairly certain there is a Guitar Hero game where you can import your avatar as well. Though don't quote me on that.