We to paint the bathroom prior to laying the tile floor just in case we spilled or dripped some paint on the floor. We decided to go with a robin's egg blue paint color, and we only painted the top of the walls. We will use wainscoating on the bottom half of the walls.
Painting the ceiling white turned out to be a real pain because we used gray primer all over the walls and ceiling. Tinting the primer gray was recommended by the guy who worked at the paint store. Four coats of white paint later, the ceiling was white. It only took two coats of blue to cover the walls. Needless to say, we will not be using gray primer again.