I think that you should keep some color in the Emperor's Throne Room. Not as blue as on the DVD's, but not totally black and white as in the pictures seen above.

That set does have a blue tinge to it. You can see it on VHS, laserdisc and still photographs taken from the set if you look for it.

Some panels are bluer than others. It has to do with light, also. If you instead of desaturating the entire set, do try to have different amounts of saturation on different parts of the set, you would get a much richer picture.