A needle felted die is pretty cool. One with QR codes is even better. But one on which each code represents a number of dice is totally neat-o-rama! Scanning a side of Shannon Henry's needle felted die pulls up Random.org's six-sided dice generator. The red pips tells you how many dice you're rolling, so you can roll up to six six-sided dice just by scanning the correct side.
Link -via Geek Crafts
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According to this site, the speed of sound in glass is 4540 m/s. So, it breaks at a third of the speed of sound. I wonder if other brittle materials have the same behavior.