To create this spectacular, magnetizing look, you are going to use paper towels that have a raised pattern. Make sure the paper towels are white. You don’t want any ink getting onto your paint. To begin, add your third coat of the black and green but this time invert the locations. Black in the middle, green around edges. This will create contrast when your paper towel pulls up paint.
While your paint is still wet, take one sheet of paper towel, with the raised pattern side facing down towards your piece, and gently press it onto your piece. Then pull back to reveal patches of pattern. If your paint begins to dry, reapply in areas you want more pattern.
This is a technique to use if your goal is a mesmerizing sea of pattern, not a perfect, orderly and symmetrical pattern. For that, you could use stencils. The video below demonstrates how I did the paper towel pattern technique.