The only thing I've actually completed to date was a short called "Last Day of the Spawncamper" that I shot and prtially edited. I wrote the screenplay and starred in it. It was fun, but it's never been fully edited.
I've been working on an adaptation, but I stopped, because I don't know if the book is available to be adapted. i don't know how to find out. So, I'm trying to decide which of my own ideas to pursue at the moment.