http://inspired-ui.com/ A showcase of the best examples of beautifully designed mobile apps – iPhone, iPad, Android, UI Patterns.
http://subtlepatterns.com/ Subtle Patterns is created and curated by me, Atle Mo. My goal is to be a high quality resource for anyone in need of tilable textured patterns, free to use.
http://abduzeedo.com/amazing-pattern-library The Amazing Pattern Library, started by Tim Holman and Claudio Guglierei, is an on going project that complies patterns shared by the most talented designers out there for you to use freely in your designs. The collection of patterns and the quality is top notch. See also: http://thepatternlibrary.com/