How to Make Crayons in a Hard Plastic Mold http://blog.innerchildcrochet.com/2013/01/how-to-make-crayons-in-a-hard-plastic-mold/
Color Formulas Used for Concrete and Cement Stone, Tile Brick, and Pavers, Made With Plastic Molds
dinosaur fossils. We ordered these plastic molds from Discount School Supply (one of my favorite online stores). $16.49 for 6 complete mold sets. In hindsight, I think we could have made the pit long and narrow so the kids could be more in a line; there was a bit of a problem with flying sand.
Plastic molds Garden Path paving slabs Stone Mold Concrete Cement Mould for garden path "Wood cut"