Here are some of my personal favourite wallpapers for your desktop (and iPhone). Sizes 1900×1200, 1024×768, 1280×800 and 800×600 are all here to fill your eyes with spacey goodness. Let your own scattering of icons sit amongst glorious nebula and spectacular scenes!
I usually have a nice space picture as my computer’s desktop wallpaper. Today someone asked me where I find them. Well I find them all over the place. In the spirit of sharing, here are ten of the best. I have credited where possible. As far as I know, all images are Creative Commons licensed (but feel free to correct me).

Orion’s Belt (Credit: Digital Sky Survey)
800×600 | 1024×768 | 1280×800 | 1900×1200 | iPhone

Galactic Centre (Credit: Susan Stolovy, Caltech)
800×600 | 1024×768 | 1280×800 | 1900×1200 | iPhone

Helix (Credit: NASA, JPL)
800×600 | 1024×768 | 1280×800 | 1900×1200 | iPhone

Rover Shadow (Credit: NASA)
800×600 | 1024×768 | 1280×800 | 1900×1200 | iPhone

Pleiades (Credit: J. Stauffer, Caltech)
800×600 | 1024×768 | 1280×800 | 1900×1200 | iPhone

ISS (Credit: STS-117 Shuttle Crew)
800×600 | 1024×768 | 1280×800 | 1900×1200 | iPhone

Four Suns (Credit: T. Pyle, SSC)
800×600 | 1024×768 | 1280×800 | 1900×1200 | iPhone

Sepia Moon (Credit: Stefan Seip)
800×600 | 1024×768 | 1280×800 | 1900×1200 | iPhone

Aurora (Credit: Joshua Strang, USAF)
800×600 | 1024×768 | 1280×800 | 1900×1200 | iPhone

NGC1977 (Credit: Martin Pugh)
800×600 | 1024×768 | 1280×800 | 1900×1200 | iPhone