You may or may not be interested but seidio has a rubberized replacement one. I'm actually on my way to purchase one to keep the OEM door free of scratches. It's 15 bucks and who knows how much for shipping, but it's probably the closest you're going to get that will "match" the rest of your case.
REPLACEMENT OEM SIZED RUBBERIZED BATTERY DOOR (WITH SPEAKER OPENING) FOR CURVE - BVY13BB8300-BKR
Be fair warned some people have had fit issues, and if you do, then call them and they'll either replace it or refund you. Too good of a company to be true it seems, but many people have attested to their services.