We manufacture and ship a concrete board form tile as well as a coned concrete panel, feel free to email me directly at lise@2stone.ca Betsy if this is something that you may be interested in, we ship!

Betsy, I see this is an old post but if you're still looking for this you might check out http://www.vertexdesignstudio.com. We were in a booth next to them at the Dwell on Design show last month and they work with a lightweight concrete process that might be what you're looking for. Nice people, based in Venice.