I don't think they do, they come in few select colors. I don't know where you'd get one though, we pulled this one off our totaled one.
But I wrote up a guide, I'll post it here in this post though there aren't any pictures:
First off, remove the [2] 7mm nuts located behind each rear wheel, on the splash guards.
There will also be a plastic clip a few inches before the bottom, it's easy to remove with a flathead screwdriver.
Next, open the liftgate and remove the [4] 7mm nuts that align the top of the bumper cover. The liftgate closes right over them.
In the middle of these there are two plastic clips.
Time to go under the car!
Look for one 10mm nut on each side, they're easy to find and access.
This next step is what I found to be most difficult. There are [3] 7mm nuts on each side of the fascia that attach it to the sides of the vehicle. You can't see them, you have to feel for them, and we used an extended tool to reach and remove these. Be patient with them, as they're tricky. The circled area is where I put my hand and could feel them. I found the right side to be hardest as the tail pipe is a big obstruction but the nuts are still removable from odd angles.
One more thing before you get ready to rip it off. Go to the right underside of the car and unclip the reverse sensor's harness. If you prefer, you could tug at the right of the fascia until you get it far enough off to see the clip and get it without going under the car [falling dirt can be annoying].
The rear bumper cover is now ready to be removed. Carefully get a balanced hold, you may need another person there to maintain it, though it's not heavy. You may manage to scratch the car or tail lights if you don't balance it! Anyways, pull straight back and it should come off.
That should do it, if not let me know!