I'm not a professional or an expert, but I like one wall being the lighter gray and the rest being the 'bit of sugar'. It depends what bathroom this is in the home. If you'll be applying makeup, the color of the room can interfere with the light of the room itself. If it's more of a 'powder room' then I think you're safe going with a little more gray on the walls.... Also depends what accessories you have or plan on using.

Just my opinion, but as the room is so small I would do all walls in the grey color. Otherwise it will make a bit choppy. btw - tile is lovely.

I just had a similar situation in my bath. I decided on a gray that was a middle tone in the gray on the floor. The light looked too plain and, at least for me, the dark was too dark; however a dark gray could look moody and dramatic in a small space.

Good point Angel. I didn't think of it making it look choppy. It takes me forever to finish a project. I would probably do one or two walls and wait a week to see how I like it... Good thing is it's just paint and reprints easily.