Serve up a spread of sinfully rich and fiery hot snacks on one side, light angelic desserts on the other. The good-versus-evil theme makes for a devilishly good time, and it solves all those costume dilemmas, too.
Pull red balloons onto glass votives (from the bottom) and cut off the excess rubber just below the rim to create moody red candle holders.
Make fun gravestones out of cardboard or foam core.
Use red lightbulbs in the Hell room.
Light up red balloons with lights.
Make the table look angelic with a white tablecloth and mounds of pillow.
In the Clouds
Serve miniature "clouds" (meringue cookies from the supermarket) on the Heaven buffet.
Trick out your table with jars of yogurt-covered almonds, marshmallows and other white treats.
Place spooky signs in the yard or on the front lawn to set the mood.
Give friends their choice of horns or halos.