to make this cushion you need
1 meter of felt, i used white
first you need to cut 6 squares to fit across normal pillow infill, then cut 6 more of the same, ( 6x six identical squares). then cut a large square to stitched them on to i measured it against the pillow infill.
with each square, fold in half and make a crease.
then open back out and fold the corners into the middle like the photo below, and then seccure with a pin.
then pin on to the pillow piece of fabric in the pattern like the picture, ensuring the edges meet
then once the main piece of fabric for the pillow is covered with the small square pieces, you are ready to start sewing.
if you want to make a no sew version of the pillow check out design fluffs tutorial here