look at magazines and see what color scheme you like.
the painter SHOULD have an opinion if they are good painters.
pick a color or two that you like and talk to your husband and the painter.
My mom's light-blue w/ white & yellow accent is very soothing. My bright orange bathroom (in a rental) is NOT soothing. I personally like a creme and olive green color. My SIL bathroom is olive green with palm tree pictures. Her other bathroom is dark blue and she brought other colors in from her wedding bouquet which she has in a vase in her bathroom. So perhaps find a picture or a shower curtain or towels that you just love, then find accent colors and matching colors.
Read online! Found this googling "color paint ideas for bathroom":
When decorating bathrooms bathroom paint color ideas should be top on your list. If you have a small bathroom steer away from dark colors that will make the room feel like you’re crawling into a cave. Colors like yellows, light blues tend to give the best results.
Yellow is cheery and may be just the color you’ll like to see first thing in the morning. It is especially good to use this as one of your bathroom paint color ideas if you have natural light in your bathroom. The yellow walls will reflect the natural light all over the room for a fresh glow. Be sure to use a pure yellow. It will probably be named something like Sunshine Yellow. Stay away from tints of orange or green. I made the mistake once of choosing a tint of yellowish-orange. I wasn’t happy with it at all! It looked like someone had smeared an ice cream pop all over my walls!
On the other hand, shades of white may be just the relaxing edge you need. When planned properly this can be a beautifully calming combo. If not put together purposefully it may appear that you just lack imagination. You can read more about how to accomplish this style here.
Cool colors like a light blue or sage make you relax. Depending on how you decorate, blue can be reminiscent of a day at the beach. Sage with purple accents can make you feel as though you just stretched out to nap in a lavender field. With these bathroom paint color ideas, you may want to add extra lighting, especially around the mirror. Cool colors like these, even thought they are light, still may soak up a lot of light. If you’re not careful, it will seem as though the lights have dimmed.
Choose bathroom paint color rather quickly. Once you understand how light affects color, you’re best decision will likely be the first. Don’t be intimidated. It’s a small space and can be painted over if you don’t get the results you’re looking for.
When you’re choosing bathroom paint color ideas it is important to remember to keep things simple. Too much design, pattern and color can confuse the eye and lead to decorating disappointment. No matter what colors you choose, limit your palette to two paint colors. One for the walls shower curtain and towels and one color to use in small amounts for an accent color.
The accent color is best used in small amounts in wall décor. You will be happiest with the outcome of your bathroom if you Keep the shower curtain the same color or as close as possible in color to the walls. It helps it to blend in better. You don’t want there to appear to be a tall wall separating the shower from the rest of the room. It is uninviting and makes the space feel smaller.