Mine are made out of foam insulation board. They aren't very fancy or anything, just plain Jane ones. I've seen quite of few real fancy/ornate ones on here and on Youtube made out of foam. Unfortunately I am not that talented. So next year I was thinking of getting some concrete molds and maybe some candle and or soap molds and then mold some ornamentation using either paper mache clay, or melted styrofoam. (melt it in acetone then pour it in the molds) Then I can glue the decorations on.