My friend Sam sent me a link to this cool American artist Boris Bally who upcycles street signs into furniture.
Here is one awesome example (though not sure how comfortable it would be):
They are really colourful and no two would be exactly the same!
John Carter, another American artist has made “Road Tested Chair” or also known as “Walk/ Don’t Walk” Chair:
Carter says that he is inspired by using “the ritual objects of our civilization as social commentary on our disposable culture.”
This chair actually lights up using a remote and a 115v AC outlet. This chair may be more comfortable than the chairs made by Borris Bally as seating surfaces have been reglazed with one inch-thick polished resin, cushioned with felt suspension. But I can only speculate! You can buy your own “Road Tested Chair” for $3700, whoa.