Similar to Hipstamatic for the iPhone, Retro Camera is a popular Android application that lets you take six different styles of nostalgia-inducing photos.
Download and install the free app, then choose from the Barbl, Little Orange Box, Xolaroid 2000, Pinhole Camera, FudgeCan, and Hipsteroku cameras. Each combines its own levels of vignetting, film scratches, and camera noise to produce uniquely old-school photos.
When you open up the app, the first thing you'll notice is the beautifully accurate retro look and feel. Each camera has its own graphical interface and viewfinder, and each truly brings you back to the days of old Lomo, Holga, and Polaroid shooters. If you like, you can enable some of the extras like geotagging or self-timer. Once you've finished snapping, click the small Gallery icon on the bottom left to pull up a neat darkroom drying line with all of your photos. Click on a photo to view or to share it via e-mail, Facebook, or Twitter. If you're an Android user who's into old-school photography, Retro Camera is a can't-miss.