Have you tried using PHAS (I think that's what it is called - the gz file that I got it in was given that name). In my menu (System -> Preferences -> More Preferences) it appears as Hidden Preferences. Under the Compiz section it has a tab for the cube, and it has an item there for the color (I think that it is the color of the top and bottom of the cube). You can try using that to change it to a different color. However, if you want a nice picture, I am not sure if it can do that, since PHAS doesn't seem to have an option for it - I wouldn't know any other way to do that, unless you chose to have 6 desktops - I think that that would stick one on the top and one on the bottom.
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