Giles Miller got a lot of press a couple of years ago for his very interesting (if not super practical) cardboard laptop cases and furniture. I just rediscovered him and learned that he's designing cardboard lighting as well. The graphic elements are formed by manipulating the the fluting in the cardboard. All the products are available through his British design collective Farm. It's also worth poking around Farm's website a bit to see what they believe in (plus they have an "about us" section that reads like the dramatic voice-over for a B movie trailer). With a strong commitment to local manufacturing, all of their products are made near the design studios.
Image from Giles Miller