50 Free Flat UI Kits For User Interface Designers

http://www.smashingapps.com/2014/04/15/50-free-flat-ui-kits-for-user-interface-designers.html#ixzz2zSTzmnXq

How To Create Circular Profile Picture and Rounded Corner Image

http://www.appcoda.com/ios-programming-circular-image-calayer/