Carl Zoch put together a brilliant camera shoot with nothing but an iPhone and a few image processing apps.

He writes:

Part of the reason I enjoyed this creative side project is to prove to myself that I don't need a $5,000 camera to achieve a creative and artistic outcome (in my opinion at least). I've been guilty of setting my sights on the best that's out there instead of honing in on my skills with the equipment that I have. It took me a while and unfortunately a lot of money to realize that the amount of equipment that I owned didn't necessarily breed killer images. Does it help? Sure. But I'm convinced now that often times the tools you have at your fingertips might be enough and might even be amazing...

Amen to that.

My favorite is this one which looks like it's got a CameraBag "color cross" effect applied maybe?

But be sure to check out the whole set.