I was reminded of this activity by The Crafty Crow yesterday and thought it looked like fun to try with my kids. Hmm. It didn't work as well as I'd hoped. First of all, the yarn wouldn't really stick to the balloon so it was frustrating for the kids. They would drape the strings on, then the strings would fall right off. I increased the amount of glue and tried to really soak the yarn. The kids just couldn't get into it and quickly quit, but I stuck with it and did eventually get the ball covered. I dumped some of the remaining glue solution over the ball when I was finished for good measure. I let it dry overnight. Some of the strings felt pretty stiff (where I strung the line through to hang it), but most of them still felt pretty yarn-like, soft, and shapeless (the photo is a little deceiving). I'm not sure what I could have done to make this work better. More soaking?