The design of our bathroom is simple but comfortable. We plan on using waterproof tiles on the walls to, again, maximize every inch of space. Many houses these days use pre-fabbed fiberglass shower enclosures. However, these consume several inches on three sides of the shower and look quite ugly. Our bathroom will be one complete wet area.
To the walls we went with the good stuff… Schluter Kerdi board. This is essentially extruded polystyrene board with a waterproof fiber membrane sealed onto either side.

Each board is affixed to the framing with special screws and washers. This creates an incredibly solid backing for virtually any tile you can think of.

We also plan on using tiles throughout the entire bathroom to create a more polished look.