My M9 was black, and my X100s is silver, and I actually think that the X100s being silver is an advantage on the street. With my black M9, when someone is at any distance, all they see is a nebulous, black blob in front of my face, which may as well be a small DSLR. With the X100s, people see it and think it's a 40 year old camera, and they don't take me seriously. I had a teenage girl holler at me from 30 feet the other day, because she wanted to see my old "film camera." She was shocked that it was brand new.
When you have a camera in front of your face, people are going to see it, so you may as well put them at ease by fooling them into thinking it's an old film camera, rather than a digital that will have their picture on facebook in an hour.