Fascinating site, but I didn't see mention of my favorite old Christmas lighting effect: The 'color wheel', the one that sat on the ground like an ocillating fan and rotated red, orange, green and blue colored pie shaped pieces of a 'pan' in front of a bright bulb, so that it would make a whole area that color.
I can still remember the grinding sound the motor made as it rotated the colors.
There was a brief resurgence of them not too long ago, but by then the magic was gone for me. Wish we'd kept the old one.