By Lizzie Bramlett — Today, it's increasingly cool to be "green." That's good, but like every great idea, this one is being claimed by the generation that happens to be embracing it. A quick look at the habits of our grandparents (and great-grandparents to anyone under the age of 40), though, shows that we still could learn quite a bit from the way they managed their resources. A great example of vintage green is how they used feedsacks. If the word "feedsack" conjures thoughts of burlap, then you probably...