A Russian stove, (in Colorado) the masonry above the fire absorbs heat and radiates it into the home, can warm the entire house on most winter days. It also provides a striking centerpiece to the main floor.
showers This link provides photos to many other outdoor shower designs/ concepts. I love outdoor showers, because they suit living in the tropics. They give a sense of being 'spoilt', so definately add to your backyard retreat.