The final release of Ubuntu 11.04 (Natty Narwhal) is going to be released on 28th April. It will be the 14th release of the Ubuntu operating system. There are a total of 18 new wallpapers that would be added in the new release including one default wallpaper that is very similar to the Ubuntu 10.10 wallpaper.
Ubuntu 11.04 Wallpapers
Click on the following screenshots to download the wallpapers individually or download all the wallpapers in one go. Download link is provided at the bottom of this post.