From tombstones and signs, to pillars, columns and coffins, foam insulation board (also known as rigid insulation) is an incredibly useful and versatile material for Halloween projects. You can find it in home centers and stores that sell building materials and it comes in varying thicknesses, most commonly 3/4 inch and 2 inch. It’s lightweight and easy to carve, melt, distress, and paint, which makes it perfect for constructing Halloween decorations. Many of the handmade tombstones you see all over the internet are made with foam insulation board. Today I’m going to show you the basics of carving and painting this foam board with a tutorial for a simple small sign with a faux stone look.