On Sundays I normally publish a photo challenge in black and white that I call Black & White Sunday. I usually come up with a fresh theme for it, but once a month I publish a recurrent (monthly) theme: after and before where you are supposed to show the same photo, regardless of the subject, in both monochrome and colour.
This is a way of encouraging you not only to set your camera to black and white setting, but to shoot in colour and to convert it into black and white in post processing. Hopefully you will enjoy this exercise in seeing and editing. After all it is all about fun. Have a beautiful day!