The Sonar theme for GNOME was created by Novell and introduced in version 11.2 of openSUSE. Its Gtk+ style has soft gradients that mix green and gray. The window border and titlebar are a combined black, with a green radial gradient at the top that looks a bit like floodlighting. The Sonar icons conform with the basic tango style, but have a bit more detail and more elaborate shading. The distinctive Sonar folder icons are especially beautiful.