So, having decided that my tiny town need a countryside, I cut some masonite in 20x20 cm squares and glued a 5mm styrofoam sheet over it so I could cut out some depressions, ditches and add a river tile or two later on. I added a small hill to. I splashed over some filler where I had cut the tiles, and when it dried, white glue/water + sand.
Melvin loves unpainted styrofoam, I think he ate some cut out pieces...
Painted with some brown, grey + desert yellow highlight on the roads. Painted styrofoam is no good to eat apparently.