Here is some reference.
http://www.foszor.com/blog/xna-color-chart/
I just want to point out that a lot of modern beautiful colors, like magenta variations and yellows are missing in favor of 20 sand colors that look super similar. Haha. I think the color palette is fine actually, just the nomenclature
If you want true green (0,255,0) you need to use Lime. DO NOT CONFUSE WITH LIMEGREEN!