I was recently asked to test out Printic, an app that allows you to turn your smartphone photos (through Instagram, Facebook, or camera roll) into glossy, 3x4 inch, Polaroid-like prints. I found the app extremely quick and easy to use, and there is even a feature that gives a preview of what your prints will look like before you order. You can even add custom text.
The photos arrived in a week, and were beautiful. I loved how the colors were bright and vivid and stayed true to the original. For only 99 cents a print, and free shipping, it's an affordable treat for yourself or a friend :)
Here is a sample of the Printics I received:
Check them out at http://www.printicapp.com