Fisheye Pro is a fun app for snapping distorted shots. It also takes video and allows you to work with photos already in your phone's photo album. My favorite part is the MX mode that takes multiple exposures (first and last images). The app is $1.99 which includes 4 lenses, 4 ring flash options, and 10 film types. The free version includes the LOMO 2 lens, basic flash, and a few film types.