Cute pics!! I made one of those cat tunnels from a long cardboard tube. Kitties like it ok, but they don't use it like the ferrets do. The ferts love their tunnels. I second what catmandu said, cardboard. My cats have a fascination with cardboard. Scout likes to shred it, Bixby loves to sit inside the boxes, and Gigi loves climbing cardboard boxes. Cost is nothing and when it gets ratty, I toss it.