Sounds like you already have quite a few different shades going on... I'm don't think another grey would help. I would probably go with a shade of white or cream. Or if you like the green hues that some of the greys have, perhaps go with a pale green.

I have a recurring nightmare. I wake..... sweating......!!! Every inch of drywall in the USA has been painted some shade of gray. Every SINGLE INCH of it.

If you must have yet another room with gray walls, try reducing an existing gray to half the formula. Or get brave, perhaps. Try a room in a deep inky navy, with blindingly white bedding. Try a clean fresh white on the walls ! Paper a bedroom in a wonderful sandy toned grass cloth! Live dangerously and paint a powder room a deep glossy plum! Honestly..... I keep having the sweats. Enough, already : )

ps........ there is no reason two rooms can not be the same neutral. This is why there is bedding, rugs, curtains, art and other decor. A room is more than the paint on the walls. Try making your world just a tad less GRAY.

I agree with Jan. This obsession with gray is just so tiresome....