Great design isn't about space--well, it is, but it's not simply a case of more is better. Great design is about how you use space.
Small houses are fascinating, less wasteful of resources, and maybe they even fit our psyches better. After all, when kids make tent houses in the lounge room--draping blankets over chairs and hiding in the "dens"--they don't build mansions. They build places of retreat. Places that wrap around them.
tinyhouses will get you started if you're interested in the small house movement.