I take back anything bad I ever said about engineers doing design.
Images have started popping up online of this recently-restored Buick Streamliner, a working show car that was originally designed and built in 1948 by mechanical engineer Norman E. Timbs. As the name implies and your eye can confirm, the car is the epitome of the streamlining style; it's also got an aluminum body that was hand-formed over a wooden form and ate up 80% of the entire cost of the car (ten large in 1948 dollars).
Practical? No. Insanely beautiful? Yes.
The car was "discovered in the desert" and restored by the California couple who purchased it at auction, and recently appeared at the 2010 Concours D'Elegance. There's a must-see gallery of the car here.