http://artist-3d.com/02prints3d/free_wallpapers/01posters.htm

http://www.kewlwallpapers.com/category/3D/

http://www.digitalblasphemy.com/freegallery.shtml

http://www.freewallpapersweb.com/Free-3D-Wallpapers.asp

http://www.visualparadox.com/

http://www.wallpapers.org/wallpapers/browsecat.php?category=69

http://visualparadox.com/gallery.htm

http://www.freedesktopwallpapers.net/3d-wallpapers.shtml

http://www.wonderwallpapers.com/3d/

http://www.wallpaps.com/category/27/