FxCamera for Android adds special effects to your photos from Android phones, including ToyCam, Fisheye, Polandroid, SymmetriCam, Warhol, and Normal. Requires and SD card.
You don't need a 5-megapixel Droid to get the best results with FxCamera. This free and fun app contains a set of filters that can simulate image processing from Polaroid or camera effects into a Warholesque snap. The auto-adjust feature makes photos sharper, and the sharing feature helps you add your own comments.