Cardoard cutouts painted black with the eyes cut out and a glow stick in a little box glued (or duct taped) to the back of the head.if you don't want to do full sized cutouts, you could just do creepy figures in windows.
It's Dalí. It's Skulls. It's too much awesome in one photo! "Women forming a skull entitled In Voluptas Mors, photograph by Philippe Halsman (in collaboration with Salvador Dalí), - Wikipedia .What fun!