Fuji Leaves -> Free
It's a really neat visual music creation app; you essentially build a soundscape out of leaves and wind...it has a very zen-like atmosphere. I know this is TouchArcade, but anyone who is into music creation should give this a try. I've gotten this free before; it seems to go free about once a year. Oh, and it does call itself a game; a game with no purpose
If you want to friend me on GC,tell me you're from TA and include your screen name.