Herb Graveyard

Spring is on it’s way, and I’m getting my gardens planned out in my head. I need a new spot for my herbs, and I have found the perfect markers for them. Check out this amazing Herb Graveyard from Instructables member PenfoldPlant. I do not have a laser cutter, but I think I can make my own versions, either with wood, or maybe plaster. Any thoughts on how to DIY these great markers?