One of the writing units we did this year was procedural writing. I kept it simple and had the kids writing How-to "books." We discussed what helps readers understand how-to books and one of the recurring ideas was illustrations/pictures so students had to include a picture of each step, with labels or captions.
A cute, funny story to read to the kids is How to Babysit a Grandpa by Jean Reagan. While it isn't a nonfiction "how-to," it tells how to hide and be quiet when grandpa rings the doorbell, how to eat snack with a grandpa, and how to play with a grandpa. Another good one is Germs Make Me Sick.
Here is the final copy paper and rubric I used. I also included some variations if you don't need/want it to be a numbered list.
topics/ideas to have the kids write:
*how to wash your hands
*how to stay healthy
*how to survive _____ grade
*how to keep Earth clean/healthy(green school idea: recycle, reuse, etc.)
*how to grow a plant
The ideas are countless! Please post any ideas you have ! :)