PVC Pipe makes great bars. You can make a x wood frame sized to your window openings and insert the PVC pipe sections into the holes in the frame. I made cages using PVC for bars. Same concept. Perfect for a "photo booth".
Made freakshow oddities for Carnevil. I spray painted the boxes that the Costco skeletons came in, found Goodwill babies to tweak and used tap lights on inside. These could be even scarier with some extras!