|gears and flowers background from TopDesignMag|
"Steampunk Wallpapers. I say, is that a gear I see? Jolly good, yo."
All the steampunk backgrounds you could desire - here are a few sources of backgrounds that I like.
(Links operational on 3/26/12, please let me know if they cease to function properly.)
30 Awesome Steampunk Wallpapers from Top Design Mag
Steampunk Wallpapers on Wallpaper Abyss