Make an electronic circuit that will trigger camera flashes in sync with a thunder soundtrack (great for Halloween)! The camera flashes are salvaged from old, broken cameras. When used along with lamps plugged into a color organ circuit, it makes a very effective lightning effect.
Here are two videos of the display in operation. In the outdoor view, the camera flashes are visible but the video camera does not pick up the color organ lamps flashing. The second video (inside the house) shows a lamp connected to the color organ flickering in sync with the soundtrack.