Great idea! Here is what I found on button technology (I had seen them in rubber - aesthetically unappealing - and in shell or polyester). It looks like the challenge is to make it cheap and indestructable:

One recent development is a button of superior strength, a ceramic button made of zirconium oxide. Beer magnate Joseph Coors Jr. decided in 1989 that there was a need for an indestructible button, and he used a ceramics research unit at the Adolph Coors Company to develop this new product. The resulting Diamond Z button debuted in 1993. It is said to be harder than steel, with 2.5 times steel's flexing strength. These men's shirt buttons are fired at 3200°F (1760°C), then polished and coated with an ivory-like finish. The proof of the Diamond Z's indestructibility is a "drop test" where a heavy pointed rod falls down a long tube onto the button. The button can withstand this rigorous ordeal as well as the everyday wear and tear of repeated washing and ironing. The Diamond Z button is, however, quite expensive to make compared to the ordinary polyester button, and for that reason it is not likely to displace the existing technology.

http://www.answers.com/topic/button?cat=health