I was just wondering if it would be possible to make it so that vassals (and PU's) of another state don't use their own color on political map but a different shade of the liege's color? I think it would look more orderly (for example no yellow square in your perfect sea of blue or feeling a need to annex just to make the borders look better) and it would show you which states are vassals without forcing you to click around (for example, seeing light-gray Hungary shows you it is the vassal of Austria).