To me Luis Barragan is one of the best architects at creating powerful spaces with the fewest possible pieces. He does this by using vibrant colors, creating rich gradients with light, and interesting materials like the raw iron in this photo.
A perfect example of good architecture not in a building:: Zaha Hadid Designs a Superyacht for shipbuilding company Blohm+Voss, reaching 128 meters in length, and a supporting structure resembling the organic ecosystem below. The form appears dynamic, resembling the flow of water. Paired with the clear, clean, and white coated aesthetics, this yacht fits right in with the water in which it glides across.