Well this is small play with ideas. What do you think of specific faction color light? Yay or Nay. Of course in not so brutal total way, only one color for one house faction but domination of one color in certain areas. Predominance of them in some proportions. Additional flavor to game.
To make them more consistent there could be some smaller hue differences or different proportions.

Nah, if anything, it could be
Nah, if anything, it could be used for the entrance to the council chambers.