The architecture firm Minarc designed and built a kitchen sink that's made from old rubber tires. It's called RUBBiSH and is made in the following manner:
The rubber from the tires is melted down and cleansed of debris, and the tiny inherent metal fibers that give a tire its road resistance are then formed into a sheet. This sheet is stretched over a base frame—made of wood, metal, or any other material out of which bathroom furniture can be fashioned—and anchored down by the drain collar. This creates a shallow-sloped surface for water to be siphoned away, but not a clunky profile; in fact, the material used is so minimal that, the manufacturer claims, the sinks use less than one pound of rubber.
Link via Make | Photo: Minarc