I’ve been meaning to try this for quite a while. I bought a cheap plastic one inch putty knife with the idea of using it to spread some paint around just to see what kinds of marks it can make. I then used a dip pen to add some detail with acrylic ink.
Acrylic on paper, palette knife and dip pen. 5.5 x 7.5 inches (13.5 x 18.5 cm).