Different Wallpapers for each desktop in 11.10
Solution 1:
Here how:
I didn't take any credit from them so i am copy the link here:
http://my.opera.com/ubuntunerd1/blog/how-to-get-multiple-desktop-wallpapers-in-ubuntu-8-4-8-10
http://ubuntuguide.net/ubuntu-11-04-unity-enable-different-wallpapers-in-each-workspaces