CameraBag
CameraBag applies 11 different effects, inlcuding a number of “toy camera” looks. It can make any boring photo look interesting.
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Adobe Photoshop Express
It’s free, and gives you all the tools – like cropping – that should be part of the built-in iPhone tools.
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TiltShift Generator – Fake Miniature
Make any scene – especially ones from higher floors of buildings – look like a miniature diorama. Very cool effect.
Photo Radar
This map is more about helping you take good pictures -later- than it is about taking pictures with your phone. The app geotags a phone snapshot, helping you find your way back later when you have your higher rez camera.
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GorillaCam
This is simply a great replacement for the iPhone’s native camera app, and it’s free. Touch-anywhere shutter, zoom, time lapse capture, bubble level and more!