If you want ultimate minimalism, you could consider hardware that isn't really designed to be a bridge saddle per se, just something that will screw into the top and serve as a saddle.
http://gregbackguitars.com/Gallery/G...ambered_b.html
Hipshot makes some smooth looking bridge hardware though I'm not sure if it's the string through body type (plus you've probably already looked at Hipshot).
http://store.hipshotproducts.com/car...oduct_list&c=3
For non-massive but functional there's the early Precision bridge, which to me is cool in its simplicity:
Or maybe you could find a funky old short-scale bass at a pawnshop and swipe its bridge. I'll bet there are some old Teiscos or Kays out there that have a simple single blade type saddle.