Another way of packing them in to small spaces is to compress them into multi-layers, as Chris Precht does with the Organicube.
OrganiCube can be easily stacked and implemented in many environments.... Getting all the facilities on a groundfloor of 9sqm, functional elements have to be compact and compressed. Through compression things get folded.
Not a lot of room to move around though....
More in TreeHugger : Organicube Squeezes Entire Apartment into 10x10x10 Cube
Credit: Christian Precht