Cardboard may not be the best material for a cat house, but those furry little creatures sure love playing in such boxes.
If you feel like spoiling your cat with a designers model, these three ones are now available from Suck UK for £15 (about $27 USD) a pop: Airplane, Fire Truck and Tank.
http://fancynotions.wordpress.com/2008/05/10/etiquette-superstition-fire/