Witch costume idea!...buy a cheap prom dress at a thrift store. It doesn't have to be black. Make a MATCHING witch hat. Many tutorials on this board for witch hats. Use a coordinating color of thrift shop fabric, scarf, flowers, etc, to make the hat match the dress. (Or cover a black cheap witch hat)
"Broken" Windows Tutorial. Use frosted contact paper and cut it apart to look like fractured glass. Apply it to the inside or outside of the window. The semi-transparent frosted contact paper takes on the appearance of the "glass" while the actual glass pane (which is transparent) disapears.