Not sure if such a resource exists.
I always have trouble with colour schemes too and have found the following links helpful:
http://www.color-wheel-pro.com/sample-schemes.html
http://www.colormatch.dk/
Also, what I did on my last free site is take a screenshot of the paysite I'm promoting and open it up in Photoshop, then select the colours of the pay site I'm promoting to base my freesite around.
Hopefully, it provides an almost seamless transgression to the surfer. We'll see if it works!