My student teacher did non-fiction writing with the students. They all got to choose an animal and then study about and write a report on that animal. On the last page of their reports they were suppose to draw a diagram of the animal - as part of the curriculum. They were suppose to put as many parts of the animal as they could think of.
This one turned out pretty cute:
Notice anything 'interesting' about this one?
Don't worry... we had him change it to a brown path running under the dog.