Although I own and shoot an M3 in BP, I would just as well have settled for an M3 in BC if that had been any easier.
My intention always was to have a camera that would not stand out too much from my predominant wardrobe color 🙂D) and I liked the M3 most for its viewfinder.
Currently I'm getting my M2 done to either charcoal gray or black paint and I've given the artist (that's what I consider him, yup) a free hand since both will serve the purpose of more stealthily carrying and shooting 😱
The camera that had a paint job most resembling a Leica M in black paint was my Chinon Memotron CE-II. Same gloss, same durability, I'd say it was identical. Nikkormat FTn also is real nice paint in black.