Thanks audiofan.
Our theater is 15.5ft by 25.5ft. The 111 inch by 69 inch screen is 32 inches from the side walls so we do not get any reflected light washing out the image on the screen.
My feelings are that you can go with virtually any color you desire as long as it is a flat finish and there is sufficient distance between the screen and the side walls.

I haven't listened to much music in recent years but now that I have my Axiom speakers I am enjoying sitting in the theater with the lights low and playing music.