Game-Icons - Huge collection of free icons for games and apps.
Wallhaven - Your source for the best high quality wallpapers on the Net!
IconArchive - Search through more than 735,000 free icons. Browse icons by category, artist, popularity, date. Organize and share your favorites.
InterfaceLIFT - High-resolution widescreen wallpapers, desktop icons, and themes for Mac OS X, Microsoft Windows...
Iconspedia - Download free png icons & Icon Packs | IconsPedia.
Picky Wallpapers - Picky Wallpapers is a good website that has the selection of HD quality wallpapers only.