I made Trip this aquarium on a plate for lunch one day. It was easy to put together and nutritious too. I used mezzaluna ravioli and apricot oatmeal bar pieces as rocks. Some leftover oven-roasted broccoli made great water plants. I cut fish out of cheese and pepperoni. Slices of a small baby carrot made nice bubbles.
Later, Trip used fish stickers to make a paper aquarium.