I found a very pale gray that I used in my kitchen, that is versatile and one that you might consider. It is by Sherwin Williams and the color name is "Fleur de Sel" .

Maybe a sort of periwinkle paint color and brass towel ring and accents. I think that would compliment the crystal accents as well.

Houzz: "BMoore and goes with greys or camel/tan." Called "calm."

Seems there are all sorts of towel bars and breaks in the walls, so a low-contrast, unobtrusive light neutral might be a relief to the eyes....? Floor tile adds interest, and so will your bits of green...