Pixlr-o-Matic has some of the best vintage effects we've seen for editing your photos.
Autodesk's retro photo-processing app is free and easy to use, though the sharing feature occasionally limits you to sharing a small image. Take a spin through Pixlr-o-matic on the iPad 2.
After landing on iOS devices, Facebook, and Chrome, Autodesk's photo filter/processing app is now available for Android.
Free filters, effects, and frames for your Android photos.
With all the features of Pixlr-o-Matic and more, the latest addition to Autodesk's apps might be all you need for mobile photo editing.