There are a couple of problems with this, first you're going to run out of basic colors before you run out of "driving forces" for mandalorians- what happens once you get "meanings" for the basic ROYGBIV, brown, white, black, gray, gold, silver, copper? Then you are forced into shades and tints of regular colors? And eventually you're going to get shades that are open to interpretation:
"My armor isn't red with blue, it's burgundy with Aquamarine. The bugundy means his fighting for animal rights in the galaxy, and the aquamarine stands for his desire to pay off his student loans."
"No, IMHO its Maroon with Turquoise, which means you're fighting for the wrongful imprisonment of your mother, and your fighting to stop the encroachment of Western Culture in the Middle East, because thats what the list says."
Seems silly to attach meanings to colors. Now I haven't read True Colors yet, but could it be that the color meanings are something regional, or different for different clans? That would make it a little more believable then one big list the entire Mando culture follows.
Now I don't mean any of this as a knock on anyones thoughts or whatever, I'm just being logical about it. I really like Karen Traviss' work on the Mando culture so far. This just seems... not the most well thought out idea.
Phil