I've tried on Google to find Tyranid papercraft from Warhammer 40K with no success. HALP!If anyone has them, please post them here!Rippers would be preferable.
If you could get ahold of the tyranid mod for Dawn of War: Dark Crusade I'm sure someone could convert the models in it and get it working in pepakura.
http://www.onemonk.com/SF002-Alien-Stalkers.html