In past we had covered Drive Icon Changer for Windows Vista which lets you to change icons of your drivers. Now here is yet another similar utility SevenDriveIconChanger which lets you to instantly change Windows 7 Drive Icon.
SevenDriveIconChanger takes image file with .ico format, once you fetch this icon file you can apply it to your desired Windows 7 drive. You can get .ico format icon files from popular deviantart forum.
SevenDriveIconChanger in Action