Watson--first, like many others, I loved that great modern quilt you posted a few weeks ago--so don't think you don't know color! That being said, check out some books on color theory--Ginny Beyer, Joen Wolfrom, Jean Wells, among others do a really good job of helping you understand color theory--it's not just color, but value and saturation that come into play. I like to find a picture of nature and pull colors from there--if you do that on line you can actually pixaliate the picture to really see all the different colors. Also, go to the paint store and start playing with color chip cards---they not only show a color, but usually show some tints, tones and shades on the same card. Good luck!