9. Mirror-Image Window Clings
For an easy yet highly impactful decoration that works beautifully for second-story windows, utilize high-definition, backlit zombie window silhouettes. These clings feature highly detailed designs of screaming faces and desperate hands pressed against the glass. When your indoor lights are turned on at night, the windows transform into a glowing gallery of trapped souls trying to escape the horrors inside. To make this look professional, use black poster board to cut out custom, jagged frames around the clings, making it look as though the glass has been shattered from the inside during a frantic struggle.