Saw this fabulous how-to Haunted Overload developed for making a haunting horse from scratch and had to share:
UPDATE: Here are a couple more links (on the next page and below as well ) to some additional builds done by other amazing prop...
Just finished the mask for my costume this year. It's paper mach with a top layer of tissues for texture, crackle spray paint for extra surface detail, and Sculpey clay for the teeth.
More pictures here.