This could be for Warhammer or Warhammer 40k. You can use this same technique for historical wargames as long as you can find the right "statue". You'll need an action figure or two, a lid from a spray can or similar substance, some foam sheeting and a piece of hardboard. Here is a sketch of what we wanted to build.
Other good sources for action figures would be garage sales and flea markets.
Once your carving is completed, prime the action figure black. We typically use Rustoleum Automotive Primer for metal and plastic models. It's only around $3-4.00 USD a can and has a fine spray so doesn't fill in details.
Now that he was painted we took the lid from our can of spray foam insulation. There are no markings on the lid, so nothing to file down. We used the same technique to paint the lid to match.
Now to distress the base to look battle worn
You'll notice we cut a circular groove for the base of the statue to fit into the top of the platform.
Using some of the coarse ballast and sand we mixed it with the paint in a small container to give it some texture.
Here we used a black wash to fill in all the recesses. You could prime the whole thing in black too, especially if the paint you found was some shade of green or red. Either way, wait until it drys before moving onto highlighting.
Have a Great Battle!
The Old Crow