In the 1920's Halloween parties were all the rage. The hostess was to decorate to the nines and the party often included games for couples. The decor and imagery was adult oriented and creepy to elegant. I've seen some beautiful examples in vintage halloween books and websites.

Guests names were written on (Halloween image, of course) place cards set on the table.
Halloween center pieces were on all tables.
Games: quizes, fortunes and stunt games were popular and the games had Halloween imagery on them.

I bet you could make some of these things with a cool graphic and a printer.
Sounds like a cool idea, good luck!