the Ginger-Beers who re-did the roof at one of our bases in East Timor made a pretty simple couch out of left over planks and shade cloth. Otherwise we made armour trees, desks, benches, weights rack and a bench for bench press
Pretty much only limited by time, space, and availability of material. Requires a keen eye for scroungable / salvagable materials.
Smoke pit right outside of our hooch that we built out of cammie netting and wood we "borrowed" from some engineers. Inside you can also see a cabinet we built out of spare plywood, a chair made out of hesco, and a wheel blown off one of our minerollers being used as a stove. Second picture
Inside. In the background is a reclining chair we built out of hesco, wood, and a cammie netting cover. We found that tabletop in an iso and had to put makeshift legs on it, and the "real" benches were "acquired" from the COC.