I've made a lot of yarn pom poms in my crafting life. They are wonderful touches to all kinds of toys. This pattern is just one way to make them. It is from when we didn't have those nice plastic forms for making them. It came from a 1960's knitting book. You use the form once so don't work to hard to make it. If you make a ball large enough for a child to toss you'll need a fairly heavy cardboard. 200 wraps are quite a few! I've put a pattern you can print and cut from the cardboard. You can make these smaller and larger if you wish.
Click to enlarge and print