DIY Very Cheap and Easy Yarn Spiderweb Tutorial from Crafty Lumberjacks. For the cost of a cheap skein of yarn, transform the interior of your house or apartment.
I know what I'm making for Halloween this year
An even easier corpse-in-a-bag, but I think this one would only work at a distance.
penabranca: Mother Earth on Turquoise ©Penabranca
Runes as talismans
Illusive by studiosap, via Behance
Halloween 15 Magic Voodoo Apothecary Bottle Labels Stickers Scrapbooking Crafts | eBay
Vévé of various Loa of the Voodoo religion.
Voodoo - http://www.grimstitchfactory.com/Voodoo.html