You might try freezing a home-made piezo mic inside a block of ice and plunking it in hot water.
– Scott Koué
Try dry ice against resonant metal combined with wood rips and styrofoam tears and rubs.
– Scott Gershin
Holding a homemade piezo mic in a bowl of soda pop and pouring in Pop Rocks candy worked perfectly.
– Sarah Weis
For the sound of breaking ice, try using a large piece of polystyrene. Give a twist so it slightly squeaks then make it snap. Then use the sound of a small metal money box dropping sharply on the ground and mix it with the other sound. With some EQ and reverb this sounds great.
– Stuart Spencer
For source sounds: Recordist Mikkel Nielsen has traveled to Sweden to record the sounds for his ice sound effect library.