My husband's always been big on composting. Whenever he has a watermelon rind or potato peelings, he throws them out into the garden area. It doesn't look terribly pretty until it's been dug under, but we do get some nice green plants.
My husband is also big into food storage, and we had a one-hundred pound bag of sunflower seeds, out of the shell. With about five pounds left, we discovered they'd gone stale, so he pitched them out into the yard, not really thinking about it.
It was only a matter of days before those seeds started to sprout, and we now have a sunflower forest right in the center of our yard. Picture it -- the yard's not very wide, being a trailer house yard, and right in the center, a stand of sunflower plants that will soon reach the ledge of my kitchen window in height.
My husband wasn't expecting those seeds to sprout -- he thought they had to be in the shell to be any good. But now we've got over fifty plants out there, ready to give us thousands of seeds each. We'll be busy, come harvesting time, but grateful for the way our seeds are being returned to us, pressed down and running over.
In the meantime, our yard looks silly, we're getting comments from neighbors, and we're never tossing seeds out there willy-nilly again.