Run same card stock through crimper along both diagonals. Continue turning the card stock about and run through the crimper, many, many times. This softens up the fibers inside the card stock. I probably ran my card stock through 20+ times.
The card stock will start to separate at the corners, gently pull the card stock apart, you'll end up with 2 sheets of faux felt from this one piece. Mine did not tear apart evenly, probably because it was a big piece. I think small pieces would work better.