I am thinking about adding a chair rail in the bathroom and right now I have 1/8" panel board with shells. What color should I paint the bottom wall of the bahroom. I have a white shower, white medicine cabnet and a white toilet topper and thinking about adding a black cabinet for the sink.

This really comes down to personall preference. We can give you all the opinions in the world, but there is no way to guarantee that you will be happy with what we suggest. Just do your own thing. Don't worry about what others will think, you're the one that's going to have to poop and shower in there. Hope someone here can give you better advice.

I agree with MDG.

I did one bathroom with light blue upper and a darker blue lower.

In main bath did walls very light gray with darker gray trim. All . Are black.

Chuck