Gstyle is a new full Gnome theme manager with some really great features which I am sure you will love if you like to customize your Desktop look constantly. [...] Gstyle can show you how a theme (any kind of theme: icons, Emerald, Metacity, etc.) actually looks, not just a preview. You will see what I mean in the screenshots below.
Gstyle can also apply different Compiz cube styles called Cubemodels.
This article aslo covers installing Compiz from GIT (with many new plugins).