The problem is that any plants you grow from green seeds will also be green.
OK, seriously... I've seen a lot of immature green seeds sprout. If you get a viable plant out of it, once the plant starts growing it's as good a plant as anything grown from a dark, speckled, mature seed. Just don't ever tell the poor thing it came from an immature seed. It might develop psychological difficulties - which could in turn lead to sexual problems, and your plant might become a hermaphrodite.
Not that there's anything wrong with that, of course. It's just not the sort of life most people would choose for their babies.