For zombie game inspiration, you can download and watch George Romero’s 1968 classic horror film, Night of the Living Dead for free.
Warpspawn games has a vampire hunting game called Methuselah designed to be played on a chessboard with a custom set of cards. One side plays Dracula and his minions, the other the vampire hunter and his assistants.
I think that some of the ideas could easily be lifted for use in more traditional miniatures games.
Ravensblight has a free paper model of a hearse and coffins. Because you can have your printer resize these, they can be used for any number of scales and games.
Add a creepy cemetary to your tabletop with this paper model from Ravensblight. The file is a pdf, so you cna resize it using your printer’s control panel to make it fit whatever scale you need.
The Jim Bowens Disturbia Yahoo Group has free rules for the Gotterdammerung WWII-Horror game.