A new update to Printicular, available for free in the Google Play store, lets Android users order square 4x4 prints from Walgreens right from their mobile device. 

Using Printicular, you can choose which images on your smartphone or tablet to print, including images from your Facebook and Instagram accounts, and pick them up from a nearby Walgreens in about an hour. Through December 31, 2012, coupon code PRNTCLR9 gives you 25% off your print order at Walgreens.