take a look at this website.
http://www.euramtec.com/sections/sec_e01.html
modern looking, OEM style, and they don't look cheap, even though they are relatively inexpensive.
There are always billet vents, but those tend to be pretty expensive, and they look it too. And you seem to have lots of options if you like oval or round, but not many other options beyond those two. Believe it or not I've found a bunch of ideas on ebay, both new and used. Billet examples are...
http://www.billetspecialties.com/ite...id=113&pid=270
http://www.phippsproducts.com/AC%20vents.htm
http://www.zirgo.com/catalog/Air-Con...-Vents/ZFBWAC2
As for OEM vents that look marginally cool, I've seen some on later model Ford F150/F250 trucks, however some tend to be over sized for a car. They are round vents, with a chromed/silver paint plastic trim bezel.