Thanks to all you guys and also both Skull & Bone & Pumkin Rot's website, I finally got around to try a paper mache skull. I have to say, it was fun & I intend to do more projects with paper mache! Cheap Cheap Cheap. I'm doing a cornfield room in our haunted house and here is my first try at those awsome looking skulls. What I need to know is,..........Knowing you guys usually use "Great Stuff" to fill the skulls, I want to keep the eyes, nose and mouth hollow to look like "Rots" skulls. Was I supposed to do the great stuff before cutting the eyes, nose, etc.............If not, what do you suggest I do to keep them looking hollow? Tape something behind each one to create a void? Thanks!