This theme has been edited to have a much more Macish look. The original author has done a brilliant in establishing a firm base!
New leopard like traffic lights for active windows. The inactive windows now have greyed buttons. Small changes here and there to make it look more like Leopard.
This also works with beryl + emerald.
Basically it needs Emerald theme engine, compiz or beryl is immaterial.
The whole pack can be downloaded from: http://sourceforge.net/projects/mac4lin
A new version 0.3 of Mac4Lin has just been released. Do check it out. Its bigger, better and more refined! This is a part of the new release.