http://www.excellentcontent.com/ (real mixed bag here - over 300 bezels - most aren't authentic, but there are some gems mixed in).
Hum, interesting. The full cabinet ones are pretty cool. I would never use them becuase they make the playfield too small. And the wallpaper in the background is hideous!
The other ones are an interesting idea. I don't mind the black bars, myself. It looks like some of them were created using the cabinet marquees.
Thanks.