Take a large piece of cardboard--any size you'd like that will fit your window--and cut out eyes, nose and mouth. Paint it black. Behind the cut out area stick with tape some orange or red tissue paper. Place it in your window with a light shining behind it. Voila--a glowing jack-o-lantern.
Using a paper lunch size sack here. Cut out a design on the front, and back if desired. Now pop in one of those battery operated tea lights. I've seen them at the Dollar Tree, 4 in a package for--ta da--a dollar. Conversely, you weight the sack with whatever is available and set a small votive in the bag, but you must beware of the possible fire hazard. The battery tea lights are your best bet when it comes to safety.