Spirelli string art cutout-Cards(SP2503). These Spirelli Cards have spiked inserts that pop out so you can stick the end of thread to the back and wind the thread diagonally around the pop-out to create a pattern. This technique can be even more intricate when you experiment with different colored threads and winding directions.
2 black, 2 white and 2 grey sheets, each with 2 cutouts.