Every week my students are given a different writing prompt to do for homework. This one was their favorite. We have a class pet bunny named Buddy, and it was their job to imagine what he did after school. It is easily changeable to be about any classroom pet, and result in wonderful writing from your creative students. It's a writing homework they will most definitely want to do!
The Pen is Mightier, is all about creating a joy for writing as well as teaching students conventions and format.