For my first mod to do to my new Jeep, I'm feeling pretty proud of myself! So glad to get rid of that cheap-looking plastic slit crap! I went with the thicker-gauge grill like someone earlier had - the 12"x24" sheets sold at Lowe's. I used a rubberized black spraypaint (Rustoleum "Undercoat") after priming, which gave it a neat texture, added to the hardiness of the paint job, and also should help prevent any possible rattling. I topped that with a couple of layers of clear-coat to add the glossy look I lost by using the rubberized paint.
Anyways, here's my finished product: