The app offers five photo styles:
Helga - toy camera feel
1974 - faded, tinted
Lolo - vibrant, colorful
Cinema - widescreen
1962 - black & white, photo journalistic feel
Ansel - smooth gradients from dark to light
Infared - bright, crisp center fades to rounded edges
After taking the photo, open CameraBag, choose a style, and be surprised by the results (like the originals they mimic, these filters can produce unpredictable images.) A perfect app, in my humble tech opinion: useful, fun, and using the mobile phone's lower resolution camera to your advantage.
Buy the app now for $2.99 (on sale,) or wait a few weeks and get the newest version -- complete with fish eye lens and custom crop options.