My first attempt at some custom cobblestone walls, debris and rubble terrain. Mostly for Bolt Action. I copied a technique demonstrated in a Youtube video. Essentially all you do is take some Elmers glue and mix whatever rocks or material you have with the glue. From there you find a base to shape and let it dry in. In the upper left is a frame made from foamboard which I lined with clear mailing tape and then used to shape the walls. After that let it dry for about 36 hours and then paint as desired.