Originally Posted by Sly

Here are a few sites with free design items that we use from time to time.

Photos:
http://unsplash.com/
http://superfamous.com/
http://picjumbo.com/
http://pixabay.com/
http://www.gratisography.com/
http://www.freeimages.com/
http://picography.co/
http://thepatternlibrary.com/

Fonts:
https://www.google.com/fonts/#

Icons:
https://www.iconfinder.com/