I use fedora core 7 with Gnome and Beryl as the desktop management. To make my Beryl Desktop more fancy, I installed Mac4Lin Emerald Theme. This theme really make me more exciting to use Linux Desktop as my operating system in my notebook. To make my Linux Desktop to become most like a Tiger Mac X OS, I installed Avant Window Navigator too. With Avant, I have a fancy launch pad like Mac X OS in my Desktop. Very impressive.
In another thing, in my Linux box, I have installed VMWare Player that playing M$ Windows XP Home Edition (provided by compaq presario V1000 bundled) with SP2 for me. (I have tried VirtualBox to play Fedora Core 8). For my virtual M$ Windows, I want to make the desktop more like Fedora too, so I installed Fedora Transformation Packet. I think this theme is very impressive for my windows.
Here is the example of my desktop with Mac4Lin and Avant :