Last week, I did a senior portrait shoot for a young man. I had shown him the finished color shots as well as several I also picked to create black and white versions of. The client asked if I could do some of the shots with only him in color and the background in black and white. I agreed that would work well for several of the photos. I ended up doing a few of these "selective color" versions. As you can see in the shot below, having a colorful subject while everything else around him is in shades of gray really makes him pop. It can really help with a more distracting background, which wasn't the case here though.
;)