I started with pressure-treated plywood. Instead of buying a full 4′x8′ sheet, I went with (3) 2′x4′ sheets that are ½ inch thick. They are a little more expensive, but worth it if you don’t have a pick-up truck.
From the start, I didn’t want my ghosts to be identical, so I traced 3 different-shaped ghosts on the 3 pieces of plywood. I also varied the height of them, but none were taller than 3 feet.
Once I was satisfied with the outlines, I snapped in the jigsaw attachment for my Matrix and cut away!
It really came in handy at the bottom of 2 of my ghosts where I created a zig zag.