2 sheets Black Bristol board
Measure the circumference of your head.
Cut a donut shape using one sheet of Bristol board.
Make a cone shape with the second sheet of Bristol board. The open end of the cone should also match your head measurement.
Fit the open end of the cone into the 'donut'. Make 1 inch cuts in the open end of the cone.
Bend cuts outward stick with glue to the underside of the 'donut'.