Those are cool! I made a 'Knights Templar" helmet for my son when he was 5, he kept that helmet and played with it till it didn't fit anymore. Similar to the first picture you posted.
hey jim i got it off of the 405th site from zombiegrimm you can go there and search for skyrim pepakura files he has 8 pages of them. you can fined every halo helmet from every game there to.