Creating a floor plan to scale, with just the walls, doors and any windows shown and then placing different fixtures that have been scaled appropriately in various locations is a big help in finding the perfect design to fit your needs in the space allowed and can even be a lot of fun.
The ultimate luxury in a fantasy bathroom would have to be a waterproof TV. You could even think of doubling the bathroom up as gym, complete with exercise bike and rowing machine. Ornaments should be unobtrusive, so choose things like small piles of pebbles and modern wall prints over candles and nick-nacks.
One of the most appealing things about the traditional bathroom is clutter gives it more of a lived-in effect, thus enhancing the traditional look. Don't be afraid to put plenty of pictures on the walls - black and white family portraits in gold frames are a good look. A chest of drawers or corner table with scented candles, aromatherapy oils or flowers will really bring the room to life. As a finishing touch an old style set of weighing scales, a large framed mirror or bulky traditional radiator will give the room that cozy old-fashioned feel.