My favorite thing so far is the "spooky" antipasto plate. I found some great ingredients at Safeway for the tray:
Cacciatore Salame - There's something sinister about these small salame sausages. They look like mummy fingers.This would be fun to make even if you're just planning to stay home on the couch tonight!
Red Windsor Cheese - Wine soaked cheddar has a veiny, purple appearance.
Cornichons - Warty little pickles.
Pickled Onions - They look like eyeballs.
Concord Grapes - I don't know if I can find these, but they'd be perfect.