The only thing missing, a Mozilla Firefox crop circle, has been made.
On Saturday, August 12 the Firefox marketing bug, bug #347226 about creating a Firefox crop cirle, was solved by the Oregon State University Linux Users Group, when they descended on a field in Oregon and made a 4 000+ square meter crop circle of Firefox (with a diameter of about 67 meters). Some photos and an article about this event is available, and they’re worth checking out.