Can living green and making muslins co-exist?

I've finished my muslin, and I will tell you that I found it immensely helpful. I think a muslin ? for beginning sewists like me, at any rate ? prevents mistakes. Even though constructing a muslin and getting the proper fit is time-consuming, I know it's a step I'll continue to take. But here is my question: What does one do with the finished muslin? I try to live green ? as much as possible ? and I don't see any option but to toss the muslin. Any ideas?.