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
Someday somewhere I´ll have sauna again!
See How This 1913 Edwardian Was Transformed Into a Modern Masterpiece: A stunning stone steam room leads to the interior sauna.
Modern sauna inside a Ski Chalet by Atelier Kastelic Buffey _