First here are the things you need:
These are pretty simple to create, and fun to do. First cut your plastic bag into about 1" strips
Open the strips up, (they should be circles) then cut them, and tie three strips together with a knot at the end,
Braid the strips. Wrap the strips around the foam ball, securing with stick pins as you go. Keep going until the ball is completely covered.
All done! Enjoy!
Happy renewing and redoing!