Sometimes it’s just fun to play.
Here we have my Fender jazz bass and I (or at least my outline) lit by a Petzl headlamp. Basically, I’m opening up the shutter and ‘painting’ with the light. Pretty simple. And a lot of fun! If your camera has a ‘bulb’ setting or if it allows you to take a really long exposure, turn off the lights, open it up, get a light, and get to painting!! You’ll be pretty impressed with what you come up with.