TreeHugger loves ideas that think out of the box; Dutch architects Arthur Rottier and Peter Jongman developed the Woonbox as a house for a "temporary stay"- the box opens and unfolds into a bath, shower, kitchen and toilet.
"The architects envisage a cubicle that has several compartments which open up to reveal different units. Designed to serve as temporary residence in places where permanent homes are difficult to locate, Woonbox can be set-up in spaces like offices and parks as makeshift measures. Woonbox would also come in handy for the poor and homeless as well as the class of populace that cannot afford large permanent establishments."
Unfortunately, there appears to be no mention of where the water comes from and where the waste goes; it is a pretty but pretty useless idea without figuring that out.::Woonbox by KAW architecten via ::the Design Blog
Other fold-out ideas from TreeHugger
Casulo: An Entire Apartment's Furniture in One Small Box
Less is More: Modular Kitchen Concept by Fevzi Karaman
Matroshka Compact Living Concept: Your Life in 43 Square Feet
Other ideas for living with less
Incubator Desk Takes Up Less Space
Foldoub Trailer Travels Small, Lives Large
Cube 6: Modern Dining Room Furniture for Small Spaces