Recycled Cardboard Bicycles For $9? 14 years ago
Stanford has been using paper bicycle design as an exercise for aspiring product designers for years now. (http://www.stanford.edu/group/me310/me310_2011/fun.html?fid=...)
I admire the guy trying to make this concept into a product, though they ultimately may be to the bike world as IKEA is to furniture (accessible but unfortunately hugely disposable)