Sry just had to! :D
http://forum.travian.us/showthread.php?t=29335
http://www.dotastrategy.com/forum/ftopic20839.html
http://www.photochopz.com/forum/member-photoshop-tutorials/4866-creating-cool-designs-sigs-backgrounds-etc-photoshop.html
http://www.ndesign-studio.com/resources/tutorials/abstract-background/
http://www.noupe.com/design/outstanding-website-background-guide-60-impressive-resources.html