On NGS group, we're doing a study of Darlene Olivia McElroy & Sandra Duran Wilson's book "Surface Treatment workshop" This week we're looking at the section using shaving cream. Spray shaving cream onto a plate. (The authors use the back of a plastic plate). Use palette knife to spread the foam evenly. Place drops of dyes, inks or paints onto the foam.
After lifting off the stencil don't wipe off the colored shaving foam, but lay it down onto another piece of card stock and press down.
Another thing to do with the shaving foam is to use interference colors. I added some iridescent inks that went with my already blended colors.
The authors give more suggestions in using shaving foam.