Gnome Wallpaper and Themes

Two great sites for gnome themes and wallpaper are gnome-look and art.gnome. For themes, remember that you should look under the GTK 2.x and the Metacity categories. You will need both unless the theme you are looking at bundles both. GTK is for widgets (buttons, apps, etc.) and Metacity is for window borders. Download the file and install using theme preferences. Other good sites for wallpaper are Socksoff, caedes, and Interfacelift.