This project only works in TURBO MODE (press shift when you click the green flag). Press space to make a random shape. Press c to Clear. Press the up arrow to change the background. Ghost affects how much it fades out, it's better 85-100. Shade affects how light/dark the shape is and it's best below 80. If you change the shape it will look better if you clear first.
My favorite is -Shape: 179 -Ghost: 86 -Color: 100 -Shade: 41 -Size: 200 -on the dark background