Free image sites

http://www.gettyimages.com/creativeimages/royaltyfree

http://www.photopin.com

https://www.flickr.com/creativecommons/

http://commons.wikimedia.org/wiki/Category:Images

http://www.sxc.hu/

http://www.freedigitalphotos.net/

http://www.morguefile.com/

http://pixabay.com

http://thegraphicsfairy.com/