Setting up a trade show the size of IIDEX generates a lot of garbage. The organizers had the bright idea of setting up a charrette for students of design schools in the area, who has 24 hours to go through the dumpsters from the setup and prepare a sculpture.
My favorite was this green wall being built by students from Ryerson University School of Architecture.
Explanation of the green wall Ryerson project.
Here is another one from Ryerson, listen to the great architectspeak explanation of it below:
Other student work:
All built from garbage in a day. From IIDEX.