Hi,
here are some examples of what I am talking about. I think there are
about a dozen or so different manufacturers, each with their own
design. Basically you put up the foam and the rebar and pour the
concrete inside the foam.

insulated concrete form
http://www.superformproducts.com/
http://www.rewardwalls.com/productov...form_01.shtml?
http://www.eco-block.com/about/index.htm
http://www.diynetwork.com/diy/hx_fou...278781,00.html