Here are six stackable chairs (two are shown): http://architizer.com/blog/stackable-chairs/
This is a designer furniture company that might be cool to look at. Most of the stuff isn’t particularly innovative in its overall formal design (i.e. tables look like typical tables, and chairs look like typical chairs), although some of the pieces have elegant solutions (details, joints) that accomplish much more than they appear to by allowing for the reconfiguring of certain components. All of the pieces are wood and have the highest level of finishing craft.
This is one of the precedents Krista and I have been looking at. I like its simplicity and its elegance in terms of geometric forms and minimal use of materials.
Saturday at the AIA Tampa Bay firm tour, we visited one firm in particular that had at least a passing interest in furniture, possibly relating to their restoration work at Hillsborough High School. Here’s a few images of models they had in their office. They also had a (cheap plywood) Rietveld Red+Blue Chair which I don’t have a picture of.