CameraBag
I found this iPhone app through Dave Shea, and I couldn’t be happier that I did. A relatively simple app, CameraBag uses the iPhone’s camera to take pictures in the style of a few famous lo-fi cameras, a famous photographer, or some generic film styles. In short, this app turns the iPhone’s crappy camera into something you might actually want to use.
I’m loving this program, too. It performs exactly as advertised - takes flawed iPhone pics and turns them into something with intentionally flawed appearance, and perhaps even a bit of artful beauty.

