Alexander Andjelkovic, an artist and designer is running a poll to select community wallpapers for Lubuntu. He writes on a mailing list, "The poll is made out of contributions submitted to our Flickr group and the top six most popular wallpapers will be added to the Lubuntu artwork package."
He also mentioned the problems he is facing, "We have a problem with the current tool for polling however, users can only vote on one alternative. Keep this in mind when you vote, as you might want to vote on a less popular wallpaper to make it more popular. I know it's pretty dull, but we'll solve it for the next time we do a poll like this."
You can participate in the poll and help community decide the Lubuntu wall paper. Here are some of the cool wallpapers which I liked.