Spray paint the bodies black, but leave the colored collars. With the flashlight disassembled, cover the center of the glass lens with an elongated diamond of yellow cellophane - the slit of a cat's eye. Cover the rest of the glass with green cellophane, leaving an opening for the slit. Reassemble the flashlights, then join them just as the little monsters above. Make a wig from a mop whose handle has been sawed off.
Smoke tumbling from the eyes and mouth comes from dry ice spritzed with water from a spray bottle.
Hook a heavy duty hanger throught the bottom of the pumpkin and hang either a long sleeved work shirt or nightgown on it, lightly stuffing with newspaper or batting. If the head leans to one side, so much the better. Tumbling or flying spiders can be achieved with novelty shop spiders tied to monofilament. Thread line through eyehooks or eyebolts attached to the porch ceiling, then run over the top of your front door. Staple monofilament in place.