Sunken tubs may be the ultimate in bathroom luxury. Stepping down into a body of water makes for a better spa experience. Look to the Japanese onsen for inspiration and lower your bathtub into the floor. To pull of this look, simplicity is the key. Right angles look best, and if you are able to accommodate a square tub go for it! When choosing a tile opt for something natural and unfussy. The goal is to create a bathtub area for relaxation so a minimal look is best.