What color should I paint my bathroom to complement off-white & emerald green ceramic wall tiles?

I want to paint the walls in my bathroom (not the tiles themselves, just the part of the wall above the tiled part). The tiles go from the floor to about halfway up the wall, and then the top half of the wall is plaster. The tiles are off-white (almost bisque) with the emerald green trim. It's a full bath, but really small with little natural light except in the late morning. The tiles are not the focal point of the room, except for possibly the green trim. Our fixtures (mirror, sconces, and towel bar) are brushed nickel. Any suggestions?