This of course is not at all game changing, but I think it would be cool to have a sun minion that changed color...or multiple light minions of various different colors.
It could really help with interesting screenshots and just for fun.
It would also be cool to have housing lamps of various colors as well. Like how they did with the Shiva chandeliers. I love those! (Though I wish they didn't take up all the chandelier spots on the floor.)