Here is some fan art I made to celebrate the first promo images of Darth Maul from the Clone Wars series. Unfortunately the initial images were too small to make high res wallpaper. But if you don't mind a little graininess, you can download these and set them as your background.
And here is the transparent .png file that I used to make the fan art. You can download it and open it as a new layer in an editing program to make your own fan art. The lightsaber might need a little touching up, but the rest of the image should fit nicely on top of any background.
>> Don't forget to check out Darth Maul's Facebook page here.