Where's the chrome?
Light dots (spots) are easy! On a long time exposure, just flick on and off a small light source, such as a penlight. I usually have one in each hand to get more volume of spots in half the time while dressed in black. You can go to www.bentpictures.com and read my rambling dissertation on light and invisibility during time exposures. Also have a bunch more of these kind of shots.
Thanks for the interest!
Still think this is the most entertaining image in the whole challenge! -JVV