Use a mannequin or a sewing form with a styrofoam wig head covered with dark fabric and then draped in tulle or gauze positioned at the top of the stairs if you don't want guests going up there during your Halloween Party.
This is soo romantic! And very easily achieved with my Amber flame battery operated tea light candles. Best ting is that they will easily last you the whole night because the battery lasts up to 40 hours! http://www.candlesrecharge.com.au