Light Paintings!!!
Light paintings can be super fun, especially if you are a creative person. You would typically go about light paintings in a pitch black room, by setting your shutter speed on timed, then taking some test pictures and adjusting your ISO and aperture. and to paint with light, you have to point the light at the camera. if you want to illuminate a subject then you would shine the light on them simple as that.
In this picture i used a light wand instead of a flashlight and it is the same premise, the only difference is the effects you can make with the light wand and that the flashlight will have more precision.