Cuban born artist Felix Gonzalez-Torres's "Untitled (Placebo)" consists of "1,200 lbs. of silver hard wrapped candy arranged to look like an area rug." More on the artist and his series of "installations of piles of paper and sweets" in this essay excerpt for the Guggenheim Museum.
Also, here are photos of the installation process (1. Open box of candy. 2. Spread candy around neatly. 3. Art.) when it was displayed at The Williams College Museum of Art.