This is kindof interesting.

http://epinoisis.com/chameleon/index.htm

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"Chameleon® is a software that can change the color scheme of your whole website in just seconds.

Want to change the contrast of the whole page? make the colors warmer, or give a complete twist to the colors of your site? Chameleon® can make this a snap!

Until now, the only choice you had was to manually process all the images of the page one by one. And not only that: you also had to modify the color of each link, text, table, background etc. And what if the result was not satisfactory? You had to start over. A real nightmare..."

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I haven't tried it but there's a demo there

David K ... www.dkingdesign.com