Supplies

When I get crates, I try and paint them up in a variety of colors.  These are all different kinds of wood.

Cherry, oak, pine, maple, driftwood, ash all different kinds of wood tones.

Civilian crates are almost never painted, and even military ones are seldom painted.

Military bases, and camps often have old drums of oil, fuel, or grease sitting around.

Even cooking oils are kept in drums, in war and in peace.

Stack a few crates or barrels around the runway and you go from a simple field to a forward airbase.