Let me run my freak flag up the pole a bit and tell you what I've been saving for several years now:
Cat whiskers. (I call them 'whiskey's for some reason). So now I joke to Excy I have DNA on our deceased 'kids' when cloning is less expensive...but seriously, I don't know why I save them.
I keep them in an old breath-mint tin with a picture of Lucy and Ethel stuffing those bonbons in their mouths.
It's amazing how many one finds when you keep your eyes out for them. I've simply thought they were too special-looking to toss out or vacuum away. Togo's in particular are white and long and very curly. Reminds me of walrus whiskers.
I met an artist a few years back who lives on the mountain and she's offered to teach me how to weave baskets with horse hair. I figure when I take her up on it, we can use the whiskies to top off the horse mane baskets.