The Artist (2012), could have a few 2 color technicolor scenes.
Anyway the whole film was shot on color film stock. Perhaps in future video editions they add some color scenes as extras.
Today B&W films can be colorized in film resoltuion, with a very larger pallete han the old Turner colorization.
The problem is that the sets of most B&W films was not planned to color, but for B*W. If you turn the TV saturation off while watching a technicolor film as Gone WIth The WInd, the B&W will not look great, cause many high saturated colors do not photograph well on B&W.
In a similar way, many B&W films do not look very well after get colorized, caused it use a lot of light grays or dark grays, that do not get saturated very well, and so the B&W film can't be colorized to look like a technicolor.
Another problem is the original B&W gradding scene to scene, that many people and studios insists that need to be not altered while colorizing. As consequence many scenes that look very bright, flat or contrasting, in a B&W film, are not "corrected" to a apropriated balance to get adequate for a nice look for colorization.
Keep thinking...