I'm experimenting with a way to automatically generate nearly any color you want. This is a small sample. Obviously some of the extremes of the last three rows are off, but many of the others could be considered "valid" insulator colors.

Look at that first row of CD 161 California's... I'd say most of those are pretty realistic colors! Now, pick names for all of them :) How about we just call them 0-0 to 0-15? ...

Now, how about you pick a CD shape (perhaps there would be a library of a dozen or something) and a color, and a light/dark value and it will render that CD in the color you specified! Or what someone thought that color was :)

Bob Alexander did something similar to this in his color reference CD. He manually (with a graphics editor) created colors for some groups of CDs. This avoids the problem of getting actual insulators in "all colors" and also allows you to fine tune the color to be what you consider "right".