Sometimes they're nicely upholstered, sometimes leather, and sometimes just simple but functional.
As with Katie Thompson's aforementioned 'Recreate' range, the SitBag line of furniture cleverly makes use of old suitcases in its quest for unique seating, and it definitely works. Created by Turkish design collective MayBeDesign, these chairs have a more retro feel than their South African counterparts, due in part to the choice of suitcases and their fantastic upholstering. More so than any of the other examples, I could actually imagine a couple of these and an ottoman scattered around the room.
Link - via mentalfloss
From the Upcoming ueue, submitted by nmiller.