button spacer, or a ruler
Step 1: Use a button hole spacer, or a ruler to measure the spacing of your dots
Step 2: Squeeze a small amount of fabric paint on a paper plate
Step 3: Use the eraser of your pencil as your polka dot stamp
Step 4: Stagger your polka dot lines
Step 5: When you think you can dot no more, take a break, eat some chocolate, and then get back to work!