Picfx lets you play around with over 100 different effects and 13 different styles to tweak your images and lets you layer effects for virtually limitless possibilities.
Like most image manipulation apps, you can snap a fresh photo with your iPhone camera or import a picture from your photo library. Across the bottom of the screen are icons of leather-bound books, each of which has a bunch of effects by category. The categories are broken up into Grunge, Classics, Textures, Frames, and several others. Once you've selected or taken a photo, the interface layout makes it easy to pick an effect from each category by swiping to browse and then tapping the effect you want.