Off the top of my head, I've looked up pictures of animals, fish, etc.
on the internet and shown and discussed the differences in shapes,
color, etc. and then created a mural.
Each student draws a giant-size fish and pastes it in place on a large
round piece of paper that several other students painted to look like
the ocean. Then we added, strands of seaweed, rocks etc. It turned out
great! The kids loved it.