I built an aluminum patch to the same dimensions as the tire carrier. I used an old beat up truck box from a rolled Ranger. Cut it into the trapezoid shape, polished it with a wire wheel, hit it with some aluminum wheel cleaner, clear coated it & bolted it up with some stainless steel bolts. It turned out pretty well for the cost of a few bolts & washers.
Plenty of vendors offer replacement patches if you want a manufactured look.
Black Forest Green 2012 JKU Sahara, Tinted Windows, Chromed Door Handles, Star Fab Door Stops, Brake controller, Poly Filled Speakers, Black Hole Mod, DIY Grill Inserts, Blinker Mod, Aries Front Bumper, Spyder Rear Bumper, 2" Rancho Lift, JKS Disconnects, 10K Warn Winch, Helix Air Compressor 315/70/17 Duratracs on 17x8.5 Warlords, IL-PU36, X-treme 9008 bulbs & PIAA's