It's not a great pool if there's not a great sauna. I don't know about the white paint though.
I know you would not have a sauna in your bathroom... but you can get the feel from the photo of painted walls, some wood detail on the ceiling and wall and nice calm tile on the floor. bright and airy
Walk in Shower Art, Design for a Lonely Sole
Sauna / Formløs Architecture
An alternative to the popular but complicated to detail trough drain... just let water drain through slats into the base below! Gallery | Australian Interior Design Awards