Ubuntu Game Icons, a project by Artificial Intellegence provides high resolution CD cover like icons for your favorite Ubuntu games. These icons are really beautiful and the entire pack includes 110 512x512 icons for commercial as well as free games plus one bonus icon for Desura.
The project was started by Artificial Intelligence as a personal project so all the icons are labelled as Ubuntu. So you may not like to use them in other distributions. But he has said that once the icon pack is complete he will try to redo them so that they can be used with other distros.
Grab the icon pack from here