Implementation
Spray enough shaving foam into your tray to give a layer approximately ¼-inch thick and slightly larger than your paper, using your ruler to create a smooth, even surface.
Add small drops of each colour to the foam and, using an old pencil, draw lines and swirls through the coloured areas. Try not to over-work the patterns as simple patterns and squiggles look best.
Carefully lay paper on top of the foam, pressing gently to create a print, and leave in place for a couple of seconds. Peel the paper away from the foam and put it aside to dry, running the ruler carefully over the picture to remove excess foam.
Credit: Original Source
Impact
Encourages EA & D, UW, C & L, L