When Ableton Certified Trainer Amit Segall broke a string on his piano, he found himself with an out of tune instrument that was perfect for multisampling. In this video, Amit shows how he took samples of his unique piano and made an instrument using Ableton Sampler:
Turn a Broken Piano into an Instrument with Sampler
Download the finished instrument for free here (right-click and select to download the file). For more information on the project and more tutorials in English and in Hebrew, see Amit's site.