I had a kitten who loved to watch the commode flush also! He would come running from wherever he was in the house to watch it. I made sure I jiggled the handle so that he wouldn't miss it! The ping pong ball game sounds great.
My Precious plays fetch. (She taught me.) She has all sorts of mice that I bought, but her "mousie" to play fetch is a rolled up piece of cardboard. That's her favorite fetching mousie. I posted elsewhere that I might market it., and Jessica told me she'd take four.
Gee, I never filled that order.
Now, to think of a price......
Lexxie, perhaps you could redesign the commode in appearance, and market it to the wealthy as a cat toy! Ping pong balls -extra purchase--plus shipping and handling.
Now to think of an ad--Get your velvet covered water fountain /swimming mouse toy today! Your cat will be the first in the neighborhood to own this easy to operate, interactive exerciser. Let kitty push the button, and see what happens! Send cash only.