One couple learned all about insulation when they began renovating their kitchen. They found that they didn't need to buy conventional fiberglass insulation. Instead, they sprayed soybean foam insulation into their walls. They discovered what other homeowners are now learning -- that the color of home insulation isn't just pink. It's also green -- as in eco-friendly. Whether the insulation is made from shredded denim, hemp or sheep's wool, alternative insulation can not only save homeowners money, but also help the environment.