http://www.freebackgrounds.com/plaza.htm

http://www.free-backgrounds.com/

http://www.freebackgrounds.com/

http://www.fg-a.com/backgrounds.htm

http://www.photos.com/en/stock-photos-category/backgrounds

http://www.backgroundstuff.com/

http://www.backgrounds.free-animations.co.uk/

http://www.free-backgrounds.com/nat1-10.shtml

http://www.indezine.com/powerpoint/backgrounds/freebackgrounds.html

http://www.allfreebackgrounds.com/background_select.html