Making Fire with Ice
I'm not sure how practical making fire with ice is, but it's something I've been wanting to try myself. I can imagine a few scenarios where I might be stranded in freezing conditions without any other means of making fire. When temperatures are well below freezing, it's often clear and sunny, so making fire with ice isn't too far out of the scope of possibilities.

    Snowshoes and Solitude: A Year in the Wabakimi Wil...
Just got done watching Les Stroud's Snowshoes and Solitude on youtube. I found it incredibly fascinating. I like to think I can take care of myself, but this would be a tough go even with all the modern tools and gear. They had to make some tough choices along the way. Part I Part II Part III Part IV Part V Part VI

    How to build a snow cave
Here's a couple videos on how to build a snow cave. I'd like to try this sometime.