Location Options and Lingo:
Natural: fields, grass, trees, mossy trees.
Urban/Rustic: interesting walls, and buildings. Variety of texture: metal, brick, wood, chippy paint, "abandoned" look, grunge. Graffiti (if requested). Near railroad (I will not EVER place you ON a railroad, even if asked). Loading docks and bridges.
Water: location with empty beach, just water and sand. Also, location under a pier. Docks near lake.
Architectural: stairs, interesting buildings, columns, doors.
City: active backgrounds, for instance, people or cars blurred in the background, city buildings in the shot, concrete, and the right amount of grunge.
Country: barn, fields, trees.
Each type of location is not necessarily exclusive, but this is just to give you an idea of options. Many locations combine several of these to make the perfect backdrop!