answer:Paper bags, boxes with holes cut in them and you can get, what I call ” The tunnel of fun” lol Walmart has them for really cheap, less than $10. They are fold up, crinkley tunnels that expand to about 2.5 feet long with a hole in the top. My cats love to dive into them. Alternate their toys so they do not become bored with them. My female Siamese goes nuts for crunched up paper balls too. Whenever I am recording my atm receipts she waits nearby for me to toss her a wad of paper balls. I just gave my daughters city kitty some wild turkey feathers and feathers from my geese. She is going nuts over the taste and smell of the wild. lol