A friend of mine posted a question on her facebook timeline: where to get stock images that do not look like stock images. I am shamelessly copying the list of URLs that were posted in response:

http://unsplash.com/
http://thestocks.im/
http://www.stocksy.com/
http://thenextweb.com/dd/2014/05/15/53-free-high-quality-image-resources/
http://www.caddis.co/blog/free-quality-non-stock-photo-resources-for-blogging