Open source interactive color theme chooser

I would like to give my users something similar to crystallines color chooser or themeroller so they can interactively theme the site.

Is there an open source solution that would go most of the way in this respect? Short of开发者_如何学Python that what color picker would you recommend?

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YUI color picker.

Ref:- http://developer.yahoo.com/yui/examples/colorpicker/colorpicker-fromscript.html