First of all, let's have a little biology lesson. Do you realize that snakes shed their skin on their own? True fact. They do this as they grow. My corn snake, Paco the Mighty, sheds about every two to three months. Snakes in the wild shed too, so it's not uncommon to find a shed skin just lying around outdoors. Seriously, no snakes were harmed in the filming of that blog post. Honest to dog.
Secondly, many Pagans use animal parts in ritual and spell work - not everyone, but many of us. As long as your specific tradition doesn't have some sort of injunction against it, and those animal parts are gathered humanely and ethically, there's nothing wrong with this at all. For more on this, read about Using Animal Parts In Ritual.