Pattrn is an unique wallpaper app for Android that gives you access to the huge collection of patterns created by the COLOURlovers community. It has been featured by Google on multiple occasions: on Google's Android Design in Action show, and on Google Play's Staff Picks, Pure Android, and Beautiful Design collections. In just over a year, it has been downloaded more than a million times with an active install base of ~300k users. In this talk, you'll learn a bit about the story behind Pattrn as well as some useful Android design and development tips that might help your app stand out.