Now I'm pretty sure that the title says it all.
There's already mechanics in modded clients which can color their gob path based on their kin color, and there's already merch robe mods of almost any color available for the taking. Modding this into the client wouldn't be too hard, considering that xcom's client for instance is capable of switching res files based on certain in-game triggers (boars change into wolves on full moon).
This would add a nice little feature to be able to diminish between kin colors more easily, and make use of all those merch robe recolors together in a single mod.