The great page EnigmaSpace.com (hope they will not be angry at me for telling this...) are celebrating the 20th anniversary after the first "MCMXC a.D." release in 1990 and they started a wallpaper contest!! Isn't it great?!
If you wanna participate, you need to subscribe in oder to upload your wallpaper in the premium section, and make sure that your contact details are up to date, so that they can inform the contest winner.
What da Hell's heaven (easy joke XD) are ya waiting for?!