OH MY GOSH when I get a cat I HAVE to do this! It would be SO funny for a guest to go to use the bathroom, but the cat is using it! But like its still so awesome that the cat just uses the toilet. I wonder if you could train it to flush, too.
Wine Cork Cat Toys - make it yourself. Drill a hole through the center of a cork, pull rickrack through the hole (attach needle and thread to one end of the rickrack to guide through the hole), knot off at both ends.