"...I need to acquire/make a giant ball of yarn. Round ball. The size of a basketball at least. I was thinking of using a cheap ball and gluing yarn or rope to it. But then I thought I should at least ask the yarn guru if anyone actually had one..."
After I stopped laughing at this email from my friend at school, I knew exactly what to do. You see, she's is getting props together for a play the Kindergarten classes are doing. 1/2 of each class are playing dogs and the others are cats. Of course, cats need yarn balls, right?
The purple ball is about 7" in diameter, the rainbow boucle is about 8-1/2" to 9" in diameter. Not quite basketball-sized, but I think they'll show up pretty well onstage. But I can't remember what the yarns are - I think the purple is a Rowan super-bulky, but I've lost the ball band from the other one.