I'm a fan of the Monolithic Dome Homes,especially those earth sheltered. When I finally build one for myself it will be more of a hybrid eco-shell though,and quite unorthidox even by Monolithic standards.I'll be using pumicecrete instead the foam for insulation.I'll also be using the old school earth form instead of wasting my money on an airform.Doing the shell and pad itself on my own will cost roughly three times the cost of the pad alone.The part that eats the money up will finishing out the rest.In the end it will be bullet proof,tornado proof,Fire proof(inside and out),hurricane proof,bomb resistant,bug resistant,flood resistant,thug resistant,NBC resistant,Rot resistant,and cost up to 60% less to heat and cool.Theres more about these at www.monolithic.com ,and their forum is at http://bbs.monolithic.com/index.php .I'm aka angelofdodd there and a platinum member in good standing.Anyone thinking of the ICF blocks you might want to check out Ft.Denali thats being built in Wassila,Ak.as we speak.Gregs place has the ICF walls with an airformed foam and shotcrete roof and is a new hybrid design.