Normally I eschew discussion of technique because, honestly, I am not a brilliant technician. I muddle my way through things.
But, here's an example of some ideas colliding in my brain.
A common thing that happens on the Internet where n00bs appear is that a n00b shows up with a need to take some photographs of products. His girlfriend is making artisanal crack pipes or something, and he has foolishly agreed to do her web site. He's got some setup and he's not happy with the results.
At some point some lighting hero will point him to a book or two, to the strobist web site, and someone will explain that you can't do product photography with continuous lights, you need to use strobes, because you need power to freeze that stationary crack pipe apparently.
Another pretty common problem that arises for n00bs as well as not-so-n00bs is shooting glass or reflective objects because, well, the reflections. This is legit hard, because you have to manage the reflections and not get a picture of your camera and a bunch of lights. You end up encasing everything in black material, and then using strip lighting or whatever to try to get highlights that reveal shape, and then you have to play games so your strip lights or reflectors don't end up reflected obviously, and then there's your camera reflected there too, arrrg.
So, obviously, anyone who isn't an idiot knows you can shoot product with continuous lighting, in fact in damn near total darkness if you have a tripod. Products don't move. You just have to use very long exposures. At this point, it popped into my head that you could use light painting methods to make the problems of shooting glass a lot easier. When you move the light around, it's not going to turn up as a sharp reflection of a light, it's just going to be a highlight; and if the room is basically pitch black to start with there's a lot less stray bullshit getting reflected (like YOU and like YOUR CAMERA).
So I hung up some black horse blankets, wiped down a bud vase, and busted out a flashlight. After a couple minutes of experimenting, and watching what was happening, I bounced the flashlight obliquely off a large chunk of paper to create a vertical strip of light, pointing the flashlight up so the spill would come back down off the ceiling. Then I used a 6 second exposure so I could waggle the paper around, to conceal, in the reflection, the nature of my ghetto "strip light." With a little experimenting you can create pretty much whatever pattern of highlights you want, and there was enough spill to light up the rest of the glass.
While it was not pitch black in there, it was pretty damn dark.
I did end up with a very slight reflection of the camera (I think?) which I burned down when I cleaned up the glass a little. Start to finish, 30 minutes, including ironing the black fabric under the vase. In addition to minor cleanup cited, +1/3 EV in post, to render the support slightly visible.