This same adaptation could be used for a toilet. Currently, holes along the inside of the bowl direct water in an angular way, so the streams flow around the outside of the bowl on flushing. I propose that a hot glue gun and a wire could be used to plug these holes so that instead, they deliver a jet of water into the center of the bowl.

These jets would serve to whip up a fine head of bubbles when the toilet was flushed, if the bowl water was first liberally doped with bubble bath or dishwashing liquid. The water in the tank should be likewise treated. Of course, the person who uses the toilet might find that their bowltop efforts also created a fair amount of foam. Imagine their surprise to find their own foamy leavings mounding into a huge bubbling monolith rising up from the bowl when the jets come on.