Possible Duplicate:
Is there a good resource or tool to help build a palette around colors I select?
Can anyone recommend a good tool / website for finding color matches for a certain color I specify?
Until now I've been using the Photoshop's opacity / overlay blend mode to get more color variatians, but I don't think this is the way to do it :D
I think http://www.colorblender.com/ is a good example of what I'm looking for, but I want something better