I mean, they could do some funky things with glasses-man from Rear Window (like, those glasses being the only thing showing with the rest of the face in shadow). Uncle Charlie could have a very twisted face (he had very evil, Jack Torrance eyebrows), as could the Strangers on a Train folks, the Vertigo nun,
especially the creepy Topaz guy... A bit like Jack Nicholson or Mads Mikkelsen, where they're perfectly normal human beings with very dramatic, even handsome faces that could reasonably scare someone if they jump out a cupboard snarling.
Hell, the Shining was basically all Jack, right? They can make masks out of the Hitchcock folks. I have faith in them.
Beyond that, they could totally throw in
Spellbound, which would be awesomely trippy and Eraserhead-ish. (That dream sequence was actually designed by Salvador Dali!)
EDIT: While I want them to do Hitchcock, I'd kill for a Giallo maze (not just Suspiria), full of corn-syrupy gore and faceless masks and trenchcoats (think Blood and Black Lace, Bird with Crystal Plumage" and bright, 3d colors. I think that'd be more fun than Hitchcock, honestly, though I seriously wouldn't mind a Hitchcock maze.