50 useful CSS snippets

http://www.hongkiat.com/blog/css-snippets-for-designers/

Nice slide show

http://ricostacruz.com/swipeshow/

Pure CSS

http://purecss.io/

Tools for Testing Responsive Websites

http://www.designyourway.net/blog/resources/tools-for-testing-responsive-websites-21-items/

Fun design

I saw this when I was searching for something else. I think the design is clever and different at least (don't really like the background) but was good for ideas.
http://www.wallhousecoffee.com/

Nice website design and icons

http://30hourfamine.org/new/biggest?utm_campaign=youth-group&utm_medium=paid-search&utm_source=google&utm_content=biggest-event&utm_term=church%20youth%20groups

IOS design cheat sheet

http://ivomynttinen.com/blog/the-ios-design-cheat-sheet-volume-2/