RPG Now has a free horror RPG module called Dead of Night: Night of the Santa Claws. It’s designed for the Dead of Night RPG, but no doubt could be modded for any other system.
Horror
Zombie Survival Guide
Danger 50,000 Volts: The Zombie Edition is a hysterical send up of both zombie movie culture and those second rate documentaries that show up on cable.
Renfield Card Game
Cheapass Games offers Renfield, a card game about parts, tools, gravestones and “yummy delicious bugs.”
Building A Burial Mound
Robet Spears has some instructions on builidng a burial mound in 25mm / 28mm scale. It’s the perfect thing for a horror game.
Spooky Trees and Fog Machine
Ironhands has some evil trees he built from kids toys, and a page explaining how he used an electric fog machine to add some great effects to his tabletop games.
Now how about some fog through the spooky trees.