Since that time, many, many graf artists have printed it, extended and enhanced the drawings, and dropped the results in their sketchbooks. Some have shared the results online in a private forum. You’ll have to find out where yourself. All works copyright their original owners:
Some have chosen to share their work publicly. Today, I saw this link in my referrer logs:
Copyright Tize One.
Which was drawn on this image from the coloring book:
It’s pretty gratifying to see what people are doing with this project.