These houses are super cool.
They incorporate flexibility into the design. so much inspiration...*brain starts whirring at 1000X a second*

http://hockhua.com/2010/09/a-tiny-apartment-transforms-into-24-rooms/
this is an apartment that can turn into 24 rooms via sliding panels and walls.
this idea of sliding panels to change the circulation and spaces of the building is really really cool.

of course there is the famous suitcase house
http://www.arcspace.com/architects/Edge/SuitCase/
this implements a similar concept.

http://www.dezeen.com/2009/01/19/sliding-house-by-drmm-2/
sliding house. a house inside a house, which slides out to double the building in size.