I went with rear wheel skirts i.l.o. wheel covers since I had the materials lying around, and it didn't seem like it would be worth it to put smooth wheel covers on 12" rims.
I'm considering front skirts, too and will upload pics if I can get around to installing them.
Here's a link to my wheel skirt installation. It was pretty simple, and only took about half an hour per wheel
http://ecomodder.com/forum/showthrea...ete-28974.html