The Crazy Man, by Pamela Porter is a great example of free verse poetry. It could be used as a set up for a poetry unity; used to discuss contemporary themes or historical themes in poetry. From there you could have students reflect on their own life and create a free verse poem.
David Bouchard's work Voices in the Wild displays his poetry that he ties into the five senses. I used this file in a Grade one class, when I began introducing the senses. It was a help in introducing and closing my lessons.