Take the fabric piece that you will use for the front of the cushion and trace a line where you want to sew the yarn fringe. I made a V-shape centered in the fabric rectangle.
To easily make fringes with the yarn, you need to create a template. Cut out a 9"x4" rectangle from the cardboard. And in the center of the cardboard rectange, make a 7"x1" slit.
Start wrapping the yarn around the cardboard template.
Once the yarn covers most of the template, place it on your fabric.
Using your sewing machine: center the presser foot in the slit and sew following the line you previously traced on the fabric. Use a small zigzag point so that the yarn is well stitched with the fabric.
Cut the yarn following the sides of the cardboard.
Remove the template! Now you have your first row of fringe.
Repeat the process as many time as needed to complete your design.
Once you are happy with the design, you need to finish sewing the cushion. Place the second fabric rectangle on top of the decorated one, both right sides turned inward. Pin the edges together and sew along, leaving an unsewn gap of 5-inches.
Turn the cushion through the 5" opening to have the right side out.
Fill the cushion with foam.
When you are done filling, pin both sides of the opening together and close it with a few hand stitches.
Feel free to go wild by making several fringe lines with different yarn colors or adding more texture by sewing a few beads or some sequins.