Space wallpaper (www.spacewallpapers.net) offers lots of free images that you can use for your computer’s desktop background (i.e. wallpaper), all of them with a space theme, of course. I love that stuff.
The space wallpapers are created from NASA, ESA and NOAO/AURA images as well as from contributions from astro-photographers and space artists around the world.
And yes Greg, nudewallpapers.net does exist.