Neuspeed made a little CNC plaque back in the late 90's, but it was rather tacky IMO. I'm pretty sure it's out of production as well.

Since the threaded brackets are made from good quality steel, there's no harm in leaving them exposed. If you're dying to cover them, you could just buy a set of pan-head stainless steel bolts and then paint the heads body color.

Technically, CA law requires you to run your front plate.
I'm not preaching, I'm just letting you know. Make your own call.