Spike

spike building: http://travel.webshots.com/photo/2650952490037928487rJgZlC
Spike on Head: http://www.ecosalon.com/meshing_around/
Spike Helmet:
Prussian King Friedrich Wilhelm IV visited Russian Czar Nicholas I in 1842 and reportedly saw a prototype for a spiked helmet on the Czar’s desk. The Prussian king promptly designed his own version, which was introduced two years before the Russian version. The story implies the Russian helmet was based on a Medieval Russian helmet found in the outskirts of Moscow. However, that helmet may have a Tartar origin, and itself may have been inspired by the Indo-Persian Kulah Khud helmets of the 15th century. Whatever the original inspiration, by the end of the 19th century, many nations—including the United States—had soldiers wearing helmets with spikes.
http://www.indiamart.com/medievalsteelcraft/antique-helmets.html lion spikes
http://www.pbs.org/wgbh/roadshow/tips/helmets.html
http://www.instructables.com/id/Homemade_World_War_1_German_Picklehaube_Helmets
http://www.instructables.com/id/How-to-make-a-cardboard-costume-helmet/
Helmet cover:
http://www.kaisersbunker.com/pt/uberzug.htm
http://www.johnnyg.westhost.com/helmets-imp-german.html