My bedroom is a grayish blue color, which is quite close in color to my comforter (which is just a bit more blue). I do find the color comforting and calming. Coming up with the color was a slight fluke... the walls were white and I was bored with them, so I got a small can of black paint which was reduced at Wal-mart and mixed it with white to get gray. After only getting one coat done (definitely needed two), I ran out of paint. Ended up getting another reduced can of paint (which was a silvery blue-gray) and used that for the second coat (after mixing in some white).
Anyway, long story short, I had seen some home makeover show and they used gray paint, which I at first thought would be hideous (and a stupid idea), but the results were pretty nice. Plus lots of colors can be mixed with gray, as in comforters, curtains, etc. I actually find the color of my walls sophisticated.