The package that comes with the winning wallpapers for the Quantal wallpaper contest has just uploaded to the Ubuntu 12.10 Quantal Quetzal repositories.
Here are the 12 winning wallpapers:
If you're not using Ubuntu 12.10, you can download the wallpapers from HERE (deb - you don't have to install it, you can simply extract it), or, you can download all the Ubuntu community wallpapers from Ubuntu Karmic to Quantal.