One place where they did get some gnome-on-gnome action was Enfilade! out in Olympia, Washington. There was a warning on the Facebook Gnome Wars page that there would essentially be a "Walking Gnome" game, and it did not look like it disappointed.
As much as I enjoy our HMGS East historical gnome games, our friends in the Pacific Northwest know how to keep things light-hearted and still look great. The different color hats on the Znombies just pops in the pictures.