I've always believed that those green things were just bile formed in the intestines. I also said a few months ago that all these people who had declared themselves stone-free were not clean at all. I was derided by alot of people who accused me of cynicism etc.
So imagine my "surprise" when Southern Belle reported the other day that the stones were flowing again. While a minority of those stones were undoubtedly newly formed the large majority were there all along, of that i'm sure.