I have been quite much into B&W shots lately. I have this kind of periods regularly. Sometimes I really love vivid colors and sometimes monochrome photos please me. For a few weeks now I have enjoyed adding grain in B&Ws and also using some high contrast settings or processing. But also those more clean ones which will give beautiful B&W skin tones are great. It much depend on the situation and my mood. I feel that sometimes the message of the photo (at least the message to myself) will be disguised by the colors. Changing the shot to B&W many times open my eyes to see a different level of that particular photograph. At least it will be worthwhile to try out.