Here at Blake's Tiny House, we live in areas with cold climates and understand how important it is to have a good building envelope.  Unfortunately, many of the traditional insulation products are made from some very unpleasant and often toxic chemicals.  

While looking about for some other options, we have come across Greensulate by Ecovative, a very interesting insulation product grown from rice hulls, cotton and fungus. 

For more information, take a look at this article from Time and a video from the always interesting TED talks.