Here's how to make lots of durable boulders, rock obstacles, etc. in short order.
1. Make an assortment of paper wads, of any size and shape you need. Arrange them on a sheet of wax paper.
2. Make a thin slurry of plaster and water (mixture should be the consistency of paint), and pour it into a shallow bowl.
3. Working quickly, saturate strips of absorbent paper towels in the plaster slurry, then drape over the paper wads. Press the plaster-soaked paper towel into the paper to define the shape, and smooth it out at the base to create a flat lip.
4. Let dry. Gently remove from the wax paper, then trim the base with scissors (I like to leave a little bit of a lip, like 1/4 inch or so.) Glue onto heavy paper, if you wish.
5. Seal with flat white paint, then spray with your favorite color of
FleckStone paint. Decorate with pebbles, twigs, model railroad
turf or
snow,
Polyfiber green, etc.
Presto...a boulder field/obstacle course for your battle mat.