Draw eyes with black marker. Hang from ceiling with fishing line. Spider Webs - Pull cotton batting apart and drape across furniture and hang in door ways. Attach little plastic spiders. Fog - Place dry ice in a container of warm water.
Rectangle flower boxed are great, because of their shape and size.
Simply set on floor next to the wall. Warning keep small children away from ice. Dead Body - Stuff old paints and shirt, place in lying position on a drip cloth or piece of plastic. Place a hat over the top of shirt, giving allusion of it being placed over a face. Fill bowls with assortment of fake guts.