I just had to take a photo of the art table after my oldest had finished spraying four colors (blue, red, green, and yellow) of liquid watercolor onto a canvas. He let the colors dry in between so the mixing wouldn’t become muddied. He let go of some of his need to control outcomes and just saw what happened. He’s deciding whether he will add to this with acrylic and brush, or let it be.
Materials: Spray bottle, liquid watercolors (undiluted), canvas, and a large space, since the spray will overshoot the canvas, sometimes by quite a lot!