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JJ.Ying’s GUI World
All about GUI design and windows customization from Ying, Jun Jiu. He has done more than 100 themes, skins, cursor packs and icon sets.
deviantART
The greatest site of all related to the customization.
Customize.org
Founded in 1998, it has grown to include a dedicated community of over 100,000 members, who have helped to build our library of high-quality customizations.
WinMatrix
Windows XP desktop customization community