The clear disc on top of a spindle of blank CDs tinted with permanent markers or affixed film or lenses could be held over the flash for interesting effects. The film used in the upper-right was harvested from binder dividers.
As with many of my experiments with Polaroid photography there are many cases where I'd self-portrait to test the technique, so as to not unnerve subjects if attempting them in the field and refine my efforts.
If a marker-colored filter was held at the right angle, two colors would show up in one shot. Then it occurred to me to try double-exposing with two different colors.
I didn't take many of this type of photo but the old results make me long for film to crack out the old gear, and make a new color-wheel.
As it was a fairly clumsy process it didn't come into use often in public, but it was usually amusing to give it a try.