Not designed by me, but once I saw it I wish I had come up with it first. A nifty idea to cut up a toilet paper tube into rings and combine them to make a rolly ball. Do check out the rest of their site for lots of other fun green ideas.
I put Blue’s multi-vitamin inside, what our roommate Pedro refers to as “cat crack” because it transforms Blue instantly from cautious cat to bff cat. The toy lasted all of 7 minutes, but a very satisfying 7 as it usually takes a blink of an eye for her to chow it down.