Is it possible to move the default Vista Wallpaper directory from C:\Windows\Web\Wallpaper? I tried the registry tweak that worked with XP, but it doesn't seem to work on Vista.
It would probably be easier to just create a new folder where you want it to be, and Move the files there instead. When you are in the Desktop Background area to change the wallpaper, you could just select the new location frome the Picture Location browse button.