There are a number of cool apps in here...with MarbleCam being the one I like the most. Also, it's free, so, gotta love that, too.
One more thing. If you love taking pics with your phone...espesh candid's, then I have a great app for you. And yes, it's free. Or at least it was when I dl'd it. It's called PopBooth Photo. It takes four different quick poses of you and puts them in the old-school photobooth mode. It's cool and you can use various fx, too.
Enjoy and tweet me some pics!