Lights or candles under the display will create a spooky show of shadows on the walls and ceilings.
Add some drama to your entry by inviting a flock of bats in to stay. There are many choices of bats on the market, for a great selection on line click on creatures. We like to use a variety of sizes.
We hammered clear thumbtacks into the beams which cover the walkway at the market. The bats were hung from the tacks using thin silver paddle wire (filament or fishing line works well too).