In response to the pyrotechnics question Marla asked in her post on this thread… We once created the effect of fireworks coming from a door on a set that 'led to a basement', where someone had set off fireworks. Was it "I Remember Mama"? In any case…we set a flashing color changing LED instrument on a stand on the floor as an up-light, and used dry ice for smoke. The smoke came through the door catching all the color flashes. It was very effective.