Beacon Graphics (our vinyl supplier) has made DIY kits. You can get get pre cut, or a 6 foot segment. For bulk orders, contact Dave Lynn at 800 762-9205. You can also stop by the Eyebeam bookstore and pick some up.
Then go to the instructable to get the steps right
Here is a set of photos from the event:
And here is some press coverage from Core77, Gizmodo, and MAKEzine