This is where a good blade safe comes into play. This one, for example gives you a sturdy container with a opening just big enough to insert a blade. It's not only secure, but not bad to look at on your bathroom counter top. When it is stuffed full, you can empty it at your local metal recycling center. I would guess it should take 6 months to fill before it needs emptying.
For less than $20, it's a pretty good deal.