I watched this AFTER watching a "mushroom mycelium replacing plastic/styrofoam (http://www.ted.com/talks/eben_bayer_are_mushrooms_the_new_plastic.html)" TED talk -- and this "Paul Stamets" guy's passion is contagious, mycelium can do FAR more than just replace plasics!
http://www.ted.com/talks/paul_stamets_on_6_ways_mushrooms_can_save_the_world.html
more info here: http://www.fungi.com/front/stamets/
The only downside - little blue jumpy guys all over the world.