HIPSTAMATIC Camera
The only app on my list that costs a few bucks but I think it’s been worth it.
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Cartoonatic – Toon Camera, Sketch & Art FX for videos and photos
Turns images into cartoons.
Ghost Capture – Free
Makes any image truly frightening with realistic ghost and witch images superimposed.
TiltShift Generator – Fake Miniature
Takes a bit of work in setting up your shot but gives decent tilt shift effects.