TMWWT, the Coen Bros. film noir riff set in 1949 was shot in colour then transferred to B/W. It is now available in France as a 3 disc collectors set including both the B/W and colour versions. Here is a link to some stills. I wish the poster of those stills had chosen a few more of Billy Bob's outfits, one of which was a nice shade of blue/baby blue.
Check it out:
The Man Who Wasn't There in color
Check it out:
The Man Who Wasn't There in color