My process starts with blank paper, I draw the flow then I do a quick mockups and test. If you can do something with Xcode no design fancy so you can test the thing, better than anything else.<p>It must feel comfortably and, sometimes other designs aren't the best example, they may stop you to find a better way, if you inspire always in the rest.
I'm no designer, but I like <a href="http://land-book.com" rel="nofollow">http://land-book.com</a> for screenshots of well-designed pages. <a href="http://pttrns.com/" rel="nofollow">http://pttrns.com/</a> does something similar for mobile apps.