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 automatically download and install wallpapers, Xsplash, GTK themes, icon themes, full themes, mouse pointers and more from gnome-look, deviantart, customize.org and others, or directly from the software source. But not only that, Gstyle can show you how a theme (any kind of theme: icons, Emerald, Metacity, etc.) actually looks, not just a preview.