Should be a snap by changing the code of your site.
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Is your question about how to change the colors in the html code of your website, or just a subjective question of what colors might go well as a new theme for your website?
Neither of these are color management questions, so you might have better luck in a different forum. For the latter question though, you could check out Adobe's Kuler website: http://kuler.adobe.com
This site contains user-submitted 5-color swatch themes that you could consider using for your site.
Nice post and recommendation.
thanks for that