Minefields are required for a future game and my plan is to build the wire markers that surround the fields using nails embedded in popsticks strung with thread, painted and flocked. The picture shows stage 1 of half lengths prior to base coating. I cut the popsticks down en-mass and filed the new edge round at the same time. I whittled the sides down a bit so they can blend in better with the table top. Banging in the nails was easy with a small hammer and the whole lot is secured with PVA glue and a sprinkle of sand.
The craft mat has 1 cm squares so the lengths are 1 cm deep by 5 and a bit long.