Made this ball for Loki, my sisters Cat. He watched me crochet it for him, I added a little bell inside.
He absolutely loves his ball, he takes it with him wherever he goes, outside to play with, inside again to have some snacks, and then with him to cuddle when he goes to sleep.
If you throw the ball he goes and catches it and brings it back to throw again, like a dog.
Loki is an amazing cat. Attached are few pictures of him with his ball.
The ball is made out of woolblend, and with time it is looking more and more felted.
Pattern is on my blog: http://woollenthoughts.blogspot.de/2012/09/crochet-ball-kitty-toy.html