Here is an idea we had for our cinematography. We were thinking of having our protagonist and villain in colour and leaving the background black and white for effects. It is just an idea and we will see where it goes but i think it would look pretty cool if we could do it.
This was an experiment we done in Georgs Workshop, we was looking at keying a character (not very neat in this example) and having it go behind an object from a photo and adding some lens blur. I took it a little bit further by taking the colour out of the background for this effect.