Here is a concept by designer Young Sang Eun that lays emphasis on hygiene. What is special about this design is that on one side it features a urinal and the other a sit-down commode. With the flip of a switch the design is capable of swiveling around.
I would love a version of this with a storm shelter. Like a Groundfridge is an innovative take on the traditional root cellar. It meets the requirements of people with their own vegetable garden, who choose to live in a modern and self-sustaining way.