A few months ago I spoke at a conference about web design. I was invited to talk about the rules of web design, a request I completely ignored when I started my part by saying there are no such things as rules of web design. What I did instead was just to pass on some tips and tools I personally use when designing. You can’t teach web design in one hour, but I covered the basics of color, typography etc. When speaking about color I talked about color harmonies and the way color makes u feel. Here are some tools I recommended to find good color combinations.
Color Match 5k Color Match
6 color palette generaor
Well Styled Color Scheme Generator
Generates Mono, Contrast, Triad, Tetrad or Analogic color schemes
Color Schemer Online
simplified online version of their desktop app
Hello, I am Melvin Rivera; creator of 
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Great tool. Always handy to know which colours will work well together.
Cheers
Excellent contribution.
or pick some colours from Mother Nature
http://www.duckbutt.com/flowers/flowers.htm
I’ve used another great color tool at Behr Paint.
http://www.behr.com/behrx/colorsmart/main.jsp/
Very Cool! Thanks! FYI… the same guy who made the original “ColorMatch 5K”, also made a revised version… http://www.colorblender.com/
Some more useful stuff – http://www.alvit.de/web-dev/color-tools-mixers-palettes.html.