If anyone was curious how those BioBricks and competing products are made, at least those with the rectangular shape, I'm pretty sure most of them are made with this:
http://ruf-briquetter.com/materials/wood-a-non-wood-biomass
They have a series of marketing videos describing the machine and pitching it to industrial users.
http://ruf-briquetter.com/materials/wood-a-non-wood-biomass
They have a series of marketing videos describing the machine and pitching it to industrial users.