another source for images, free, textures and more...
http://morguefile.com/archive/browse/#/?display_type=1&terms=pattern,texture&sort=last_zip&page=1&ttl=11147&lmt=24
and if you need background (these were made for screen savers) images of any type, look here...and search around for style/size/etc.
http://wall.alphacoders.com/index.php?s=Earth