Now it's time to stamp the pattern. Consider doing a dry run of the stamping technique on a sample piece of fabric or cardboard. This will help you master the technique and determine the number of stamps you'll need to fill the canvas.
Dip the drywall mud masher in the lighter paint tray. Make sure you get a good variety of hues on the masher. Place masher over the canvas and stamp in the upper left corner. Continue stamping across the first row, picking up more paint, if necessary.
When you move on to the second row, use the darker paint. As you continue stamping the canvas, alternate light and dark colors in each row. Let paint dry.