Different Background Images for each Cube Surface

This has been bugging us at SoSLUG for some time well ok then, me. In compizconfig-settings-manager >> Desktop Cube if you set your number of desktop surfaces to four (4) this gives you your basic cube and quite naturally you would assume given that you can define each of the chosen images for each face, that each desktop image would display the selected image you have chosen. You would think that wouldn't you I know I did.