I love the luxury of a hot bath by candlelight. A favourite experience, as I've mentioned before is listening to the owls hoot in the forest as I soak!
Our bathroom is quite tiny. Fitted simply, white tiles and wooden walls and floor - it cost very little. I made the gingham curtains 12 years ago, the shower curtain is plain white, and towels - nice, if old and well washed - are warmed by the radiator below. A pale grey, linen-lined basket holds the clutter, hidden under more fresh towels and a Tumbletwist cotton mat is on the floor.
The decorative things on the windowledge and the wall sconce cost a few pounds. (In summer I always have small glasses of wild flowers at the window) and I use a rose glycerine soap from Crabtree and Evelyn so it always smells gorgeous.
The fact, hard to believe, that I didn't live in a house with a bath until I was 22, may account for the feeling I have that such a simple bathroom is luxurious!