I got a couple laying around:
1: Reaper hood (sorta like in assasins creed) but for a grim reaper.
2: Werewolf claws, to go on hands and feet. Maybe a snout too for the full thing...
3: Ribs, ribs that stick out the torso like in the old alien films, to add a yucky and scary effect.

Not sure, hope someone likes em...