“In a sense, virtually all buildings are hybrids of one sort or another. Most modern buildings employ a wide range of materials, some “natural” some not. A strawbale house, for instance, is most likely a hybrid of strawbales and conventional wood framing. Unless the building is a dome or vault, the roof is likely framed with wood or steel. Our domed home is a hybrid of earthbag and papercrete materials. I know of a fine circular home that was minimally framed with 2X4 studs and then strawbales set on their ends provided the insulation.
I am completely in favor of using hybrid building concepts, because it frees the mind to use whatever material or technique is appropriate for any given application or aesthetic. Cob is a wonderful material for creating curved, sensuous forms; adobe and rammed earth are great for thick, fairly straight walls that serve as thermal mass; earthbags can be used for either curved or straight walls that can be either insulation or thermal mass, depending on what they are filled with; straw bales are best used for straight, thick, insulating walls; cordwood construction provides both thermal mass and insulation, and is easiest when forming straight walls; old tires make great retaining walls, or even foundations for other materials; papercrete is primarily an insulating material that can be used as a plaster, or a structural material and is extremely malleable; rocks provide wonderful thermal mass and can be stacked in a variety of shapes.
I suggest that you take advantage of the materials that can be found nearby that do the job required and appeal to your fancy. If it weren’t for building codes, the only rules for how you build would be the laws of physics and mother nature. So, go for it when you can!”
Source: Green Home Building.com
Image source: Building with Awareness.com
Image source: Casa de Tierra, http://www.casadetierra.com/projects/casas_el_encanto.html
Image source: Info Barrel