A jet bath with a rose window. What if you created french sliding doors, the ones that sit inside the wall when open, so that if you wanted to section the bath tub from the sinks, you could simply pull them closed? Not sure if it would work.
I must be drawn to the gray, slate-like tile. We don't have room for a tub, but I really love the floors, as well. I'm not so sure about the dark cabinet. Thoughts? Google Image Result for http://www.socketsite.com/171%252025th%2520Master%2520Bath.jpg