It would only be useful if we had a way to add a color via code while in-game.
For example, have a square in your paint can that you can select, and type /color 44 61 21 00, (forget how color system worked, I haven't played in forever...this is why my avatar is out-dated...) and you get that color. I've wanted this for a while, and yeah, this post should probably be in suggestions. Ah well.