This house is so cool. It's made entirely of premade beams (albeit on a gigantic scale). But if we're being honest, it's the pool we really love. (Where did the "royal we" come from?) How cool would it be to swim in this?!
There's also this really cool time lapse video of the construction of both the scale model and the actual house. Plus, it's in Spain, so really, there's no way I could want to live here more.
Marmol Radziner also does some cool prefabs too. It seems cheaper than buying an existing house, but then you have to figure in shipping ($6-8/mile!) and land costs. So maybe a wash? Your take? Would you go the prefab route?