This sounds like a CRAZY idea, but I build plastic models, so this might actually work.
Maybe you can try masking off everything on your phone except for the bezel then sand it down til all the chrome is gone (low grit to higher grit for a smooth finish). After cleaning all of it up, use any color spray paint you want to repaint the bezel. You might need primer for it, depending on what kind of paint you use. Maybe topcoat it as well to protect the paint. Just make sure you spray in very light coats and it shouldn't run underneath the masking tape. :P
Obviously, this will take a lot of work, but that's the only thing I can think of if you can't find spare parts.
Also, the person mbernusg mentioned in his post might've done something similar. Just a random guess though.
Device: Nexus 4 (4.2.2)