I keep a list of colors/RGB values I've specifically matched, or just ones which looked 'cool' at the time. If you don't already have the Color Finder software, it's definitely worth it. Become proficient at tabbing through the colors and using the arrow keys so you can watch your lights and blend the color and you can come up with combos pretty quick.
Now the kicker is, in the software (at least LSP), these color combos don't look anything like what they are on the nodes...the warm whites look like dirty browns, snow white looks more like an almond, etc.
60, 31, 07 - Warm white - very close to mineature lights
60, 26, 04 - yellow-orange candle flame
83, 29, 00 - Lemon yellow
48, 04, 00 - Rich Halloween orange
135, 19, 00 - Pumpkin orange
255, 23, 00 - Bright Halloween orange
29, 00, 14 - Somewhat purple
05, 00, 02 - other purple
13, 00, 04 - 'ultra' violet
255, 208, 107 - Snow White