Thanks to the ever encroaching hand of Christmas, if you want to get any good stuff for Halloween you have a narrow two week window. For most places this is the first two weekends after Labor Day, after that, all the good stuff's gone and you're left staring at a pair of plastic wings and a half warped Homer Simpson mask.
Point being, if you take this stuff seriously, you should have started haunting around this past Saturday. Which is exactly what I did.
First thing I did was put down a heavy layer of white spray paint, mostly to stop the plaster leaching and to give me a nice flat canvas.
Then I sponged on a slightly yellow-tan color and shadowed some of the lines/eyesockets etc. All in all it took me around 2-3 hours as my husband finished up Bioshock Infinite so we could finally talk about SPOILERS.