Here is the brand new demo which appears in the 2007 edition of Michigan's largest Haunted House publication , Fearfinder.

To turn you face into a Halloween Mask you will need: 1/2 lb. of Prosthetic Grade Cream Alginate, 3, one gallon buckets, 1 roll of plaster bandages, cotton fiber, 2 pair of latex gloves,  4 lbs. of oil based clay, 1 crock pot,  10 lbs. of water based clay, Two, 2" Chip brushes, 1 Quart of RD-407 Mask Latex (slip latex or casting latex - different names for the same product) 10 lbs. of White Hyro Cal. You will also need the Free Adobe Acrobat Readerto view the document.

Here is a more detailed instructional on turning your face into a latex monster mask. This is same demo as above but with much more commentary and of course some extra photos of the process. This one appears in issue 7 of Horrorshow Magazine.