I just got some trim at home depot. There really wasn't a choice. My trim was a lot stiffer than Airjockie's trim (Which actually looks like leather draped over the front)
I got the more plastic type, versus the vinyl type of trim. EG has the exact same stuff as I did.
then I put the rounded bit on the bottom (The stuff that sticks up over the ground cover). The important thing to remember is that you need to measure out the corner bends to make sure it looks symmetrical.
With the ED bumper (As I imagine we're talking about) the curvature should look a LOT better than the squared off corner of the CRX bumper - like EG's does. From there, don't be afraid to make that sucker drag on the ground. Get large rivets and fender washers for each rivet. I (On Clayton's suggestion) painted each rivet with black nailpolish to not only attempt to conceal them, but to prevent them from rusting. Use fender washers on the back of the bumper skin.
I also held the shape of the corner in with two coat hangers. The coat hangers will need to be in place for a few weeks, but it will contort and take that shape so that soon you can take the hangers out.
To flare the bottoms of the trim out, cut the top to be shorter, to make them curve in, cut the top longer. Mount it low on the bumper skin (Again don't be afraid to scrape the ground, that's what it's there for)
-> Steve
Also, the lower airdam from the first gen S-10 Blazer / Truck fits, mounts and costs $20 new.