No, not just out of snow. You can make them out of anything. The enchantment is rather broad in what it can bind to and affect. I-I mean it's definitely an idea. But the magic needed to keep them moving is...taxing, draining too. Which brings up another point. Making something for non-magic users to wear or use s-so they can use magic themselves. I-I discussed it with Lupin prior to this...I wonder if it could work. If you had a conduit between the user and the magic so that they could wield themselves, it would be fantastic!