When I think of MK dominant colors, I think of Mickey's colors - bright red, black, white and yellow. (I carried these throughout a WDW scrapbook, looked nice) For Epcot, maybe silvers and blues. For MGM, hmmm, how about blue and yellow (the sorcerer's hat). And yes, greens and khakis for AK.
I do agree with the previous poster that depending on why you are asking, if it is for scrapbooking, sometimes it's best to key your colors to the pictures themselves. On the other hand, a theme color carried throughout the book can be very effective.
Lin