On Thursday I spent a few hours in a friends garage playing with dyes. She had tables set up for 8 people to join us. Masks were worn and we kept our distance.... This is getting a little old.
Anyway, I played with thickened dyes and stencils. At one point I missed the cloth and had stenciled on the plastic covering the table. Light bulb moment! I didn't take a picture of the dyes on the plastic, but did get a pic of the ghost. I see that I need more play with this method.