Here's a guy who carves his instruments out of ice. (Daily Mail article.)
I'd think that'd create some difficulties: ice is not exactly the easiest material to work with, even when it's cold. And I note that he tends to stay away from the wind instruments. But it works well, given that. And it reminds me that cold weather is coming here, it's already started frosting in the evening, and the days are getting shorter and nippy. I'm glad I can stay indoors while I play.