It is amazing how creative one can get with just cardbox. Here are a few examples of how you can turn a piece of corrugated cardbox into something quite unexpected.

Cardboard blankets by
Diane Steverlynck

James Roberts' cardboard hangers available
here.

A business card on a piece of cardboard.(via
allgraphicdesign).

BioTube Bench by
Julian Lwin. (via
Inhabitat)

Installation made from honeycombed cardboard panels and rolled up fabric by
CJ Lim/Studio 8 Architects at the subway entrance in London. (via
Dezeen)

Cardboard office by French artist
Paul Coudamy. (via
Dezeen)