Adding a different wallpaper for every desktop

When you are using Ubuntu (Gnome) there is no way to add a wallpaper for every desktop. Right now, you must resort to trickery with an app to create the "efect" but the result is far from perfect. A good thing could be defining more options so you can choose the Default behavior (one for all) of Separated (you choise the one you like). It could even "remember" the last used in every desktop for cases when you (ie) have 5 desktops and then set only 3 and then 5 again. If you are adding a "new" desktop (ie. 6) then set the standard or none and so on.