Icon Tweaker can change all Windows system icons at once. It ships with several icon sets that change most (if not all) of the default Windows system icons from My Computer to Printers and Folders. The default installation of Icon Tweaker comes with 11 icon sets that can be applied instantly to Windows. Changes do take effect immediately after hitting the apply button.

But don’t worry, there is always the chance to revert the changes back to the original settings in case that new icon theme did not fit perfectly after all.

New icon sets can be loaded into the application, a search on the Internet reveals several locations that contain icon sets that can be downloaded, for example the selection at Skinbase or Crystal XP. I’m not that sure about system compatibility though. Icon Tweaker runs fine on Windows XP Service Pack 3 but it’s difficulty to tell because the author’s homepage is not available currently.