An amazing Skyrim Dragon Priest mask by Tumblr user props-n-at! Check out the link for more pictures and a sort of visual/written tutorial. Part 1 of the process is at this post: http://props-n-at.tumblr.com/post/69951165035/so-its-been-a-while-since-i-posted-anything
Skyrim: Dragon Priest/Mask V.2 by UnknownSoldier9865 on deviantART - I eventually found and fought for all of these, but I never wore them. Wish there had been a stand of some sort to display them. They are very neat looking!