I have a couple of amazing Leviathn photos from last year that I'm not sure I had time to put up. The girls came as Leviathan and had head masks that were almost all teeth with black mesh over their faces as the inside of the mouth and a long tongue. They were the best, most original costume I think I've seen at a Supernatural Con.
I'll try and find them.

I'm in the same boat as you. Hookman is sounding about my speed right now! LOL