You will need pencil; ruler; white cushion cover; black yarn; scissors; needle; cushion insert.
ONE Use pencil and ruler to trace a diamond shape onto cushion cover.
TWO Thread a 40cm piece of yarn onto a needle. Stitch along top outer line, with approx. 3-5mm stitches, starting from the outer corner, until you reach the top of the diamond.
THREE When you come to the end of the row, your final stitch should end within the cushion and you should have approximately 10cm of yarn left at the bottom as a tassel.
FOUR Start second row about 3-5mm away from first row, running parallel. Repeat until you reach bottom of the shape. Repeat on the opposite side.
FIVE Trim tassels so that they are all neat. Fill cushion cover with insert.