I was just thinking of a new feature of window blinds that would be cool and probably not too difficult to implement.  If we could have a setting that makes the various open windows more and more transparent/dark/light the farther back they are it would produce a 3D effect that would help some of the 3D skins look more 3D.  In essence only the currently active window would be fully opaque and each new window to become active makes the previous windows shift down a notch or something simillar.  I'll let you figure out the alogrithm, but you get the idea.