Check out Skulls Unlimited International, a great source for skull photos from almost every species imaginable. If you are looking to build a werewolf prop start here and take a look at the wolf skulls...check out the owl skulls as well because they are pretty darn creepy. (especially the barn owl)
Skulls Unlimited International is a great inspirational resource. They also have a great selection of t-shirts if you want to be a cool fashion statement.