Well, i saw this news post in G256.com:
Sites Posting WinXP Screens, Themes, and Colors [ 3 Comments ]
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Tubby Wednesday November 7, 2001 6:17 PM Your Time
Here are a few sites that you can find LogOn screens (since LogOnXP is not up), themes, colors, and general Windows art:
http://www.deviantart.com/WinCustomize
http://www.wincustomize.com/Customize.org
http://www.skinbase.org/
http://www.customize.org/
Keep in mind that due to the recent popularity of WindowsXP art, many sites are slow or have temporarily shut down due to bandwidth restrictions.
I haven't checked it out yet.....