Transparency is a theme that utilizes the beauty of Ubuntu's ability to create great, vibrant graphics. It comes with a set of instructions that are easy to follow. Try this theme on your Gnome desktop.
Watch the tutorial at http://www.youtube.com/watch?v=J8H2lsdJ4QI&feature=player_profilepage .
The wallpaper was not made by me nor do I claim to have ownership of it. It is from the site http://awesomewallpapers.wordpress.com/2009/06/19/ubuntu-wallpaper-set-4/.