We do have a window in the bathroom, so we so get some natural light. The thing is that we usually have the blinds closed because it is right by the toilet and next to the neighbors' house. I know that I want more color than neutrals because our house is so neutral overall. Plus I have always wanted color, but DH was not up for it. So, now that I have the opportunity, I am going to take it!
When we bought our last house I made it clear to DH that I am TIRED of white walls, we painted everything a color, including the ceilings. DH was very resistant to the idea at first but when it was all done he loved it and finally admitted that I was right, color makes everything look better.
The Dry Sage I recommended would be a great 'first' color. It is a color yet neutral so matching things is easy and it is very easy on the eyes. It also isn't too feminine so the men can appreciate it more.