i've recently changed the bezel to black. it was pretty simple. just watched a youtube video before the operation.
couple things to note.
-you need to take the round red dash sticker that is pasted on the top left of the phone (back). this will in turn void your warranty..
-be careful when you are taking off the taped contacts for the top two buttons, gotta be smart about peeling it off.. i used a mini screwdriver and helped it along... no prob!
as far as i can see, the bezel is oem that i have, but i guess some company paints them, looks pretty solid, have had it on since monday and no issues to report.
i have images of the silver bezel and black bezel that ill post asap for you (im sure there are lots out there though).
I was at first hesitant to change the bezel, but i was having issues with the trackball so was forced to do it, as no warranty anyways (AFAIC)..