My in-laws bought a beautiful hand-made, extra-large wicker cat carrier for Jamie. I took the door off, so he could use it as a bed. He used it occasionally as a kitten, and then ignored it for about three years. He now uses it once in a while, because it is currently on top of a kitchen cabinet. Anytime we get something delivered, he immediately wants the cardboard box. The box generally sits in the middle of the living room for about two months, until I get sick of moving it when vacuuming. Then it goes down the cellar, and I replace it with a brown paper shopping bag, until we get another delivery. He has a cat tunnel, a cat tree, several perches, a "rattling cat bag", etc., but there's simply nothing like a good old cardboard carton!