Back in 5th grade art class, our class put some dyes in a water basin, then "printed" the swirl patterns onto a paper by placing said paper on top of the water surface.

I remember being quite fascinated by the patterns on the paper, and also the swirls that were made when adding food coloring to water. I definitely would have loved this kind of game back then (and even now of course), so maybe there's some merit to re-skinning the game for a younger audience :)