Try "Sea Salt" by Sherwin Williams. I used that color in a bathroom and absolutely love it. It is light enough for a bathroom without being plain white. It will go beautifully with subway tile and silvery gray tones!

I think a dark gray would make it interesting and rich looking while bringing out the colors of the carrara marble.

HI -- Because it is a small bathroom I would paint it all white . Paint the ceiling a dark grey and then add color with the décor items and towels . Check out the light up mirrors at Ikea .... I think the round one would work for this room. I think the Martha Stewart Paint has a pearlized white which would add some glamour .