This stuff is seriously cluttering my bookmarks so I'm just going to blast you with all of them. There is quite a proliferation of interesting and unique chair concepts out there- here are a few that caught my eye.

Strap-On Chairs (via Geekologie)

In the Round Chair - made from one continuous piece of tubing covered by one continuous tube of knitted material (via DesignSpotter)

2-Legged Self-Supporting Bench (via Yanko Design)

Rocking Wheel Chair (via TreeHugger)

Wall Art Chair - converts from a piece of art to a cantilevered chair (via Yanko Design)