I usually have students create “a creative interpretation of the ISPO model”. They come up with the coolest ideas of illustrating the cycle. They include things like roller coasters, a play on the water cycle, a play on the digestive system (always hilarious), recipes for making food, I even had one that used doing laundry as a way to explain the ISPO model. I always require full color and ask them to use the whole piece of paper (8 1/2"x11" printer paper).