The makers of Monday Night Combat were taking suggestions for official wallpapers; unsurprisingly, Pitgirl - the game's booty-shaking NPC - figured prominently. They're still taking requests and have turned it into a contest.
You don't have to create the wallpaper or even draw anything. Just give Uber Entertainment an awesome concept. For example, Support riding a buckin' Bouncer. Five winners get a signed print of their wallpaper idea and a free copy of the game. Uber is running this contest - we aren't - so see the link for more details. Repeat, posting ideas in the comments is fine, but we're not the ones judging or awarding this stuff.
MNC Wallpaper Contest! [Uber Entertainment Forums]