Here are the special Halloween models I released so far on my papercraft webpage:
2009: The Nightmare Before Christmas / Kingdom Hearts Oogie Boogie
2010: Warcraft III Undead Graveyard
2011: LEGO Castle Ghost
2012: World of Warcraft Goblin Harvest Golem
Parts and instructions for these (and lots more!) papercraft models are available from my papercraft webpage: [link]
Happy Halloween and have fun building!