Iconfactory.com are new masters on the board, in fact they are already on top of things for a longer period of time, for designing manuals and especially icons. Customizing your working environment has gained enormous importance among designers, and many others. Iconfactory offers a wide range of freely available icons, sometimes they also offer desktops and whole stylized environments.
This img is a grasp out of their latest release, a manual for the new Wii. Wiiiiiiiiiiiiiiiiiiiiiii, is not to be swallowed or eaten :)