What's the best way to do a ground cover that's fast drying? It doesn't need to be beautiful, as it will be covered by a light powdering of snow (for which I will probably use plastier of paris). So it will represent frozen earth.
I'm considering using styrofoam that's been cut by an electric wire cutter, then painting it brown with acrylics, with some light sand and PVC glue mixed into the paint. Thoughts?