I used one sub-program coding "g" for this project and repeated it with four colours: Red. Blue, Green, & Black. I randomized the PEN size. HOLD down mouse or click STOP when you have the art work you want. Note: No Turbo Mode needed. Experimental veeeeereeeeyy slow filling algorithm inside...
Original Instructions from @MonkeyBean2: Click to stop, maybe use turbo mode (shift+click). (sprite based, but I might make a mathematical version some time)