I already enjoy sharing the images of "I wish I didn't have to sleep! with students. The companion books will definitely enhance my Haring unit.
I usually use Haring with fourth grade students. They have done a variety of projects over the years generally focusing on the simplicity of line in Haring's images as well as the implied movement in his work.
This year students connected Haring to a project in trace printing. They created a Haring figure and included hearts in the image. These were then used for printing. Here are some images of student works.
You can find another project connection here.