I just finished up a new Jason hockey mask.
Paint job was a quickie... only about a couple of hours.
The base what flat white spraypaint mixed with rustoleum "summer squash". The detailing was airbrushed: Createx translucent sand, medium brown and black.
I did a few layers of that same routine, lightly scuffing it up with some 220 grit sandpaper in between.
The final bit of weathering was graphite dust from a pencil. I shaved a carpenter's pencil with a razor and rubbed it in to various spots on the mask.
All that's left is adding the straps and some padding to the inside.
Now I'm starting to feel this awful urge to make one for each movie!
I know there are a couple of other slasher fans 'round here! Feel free to chime in with your own creepy stuff.