Hey that's great! We saw a sight that's a "how to" on this sort of structuring, and we so wanted to make something! But then we forgot how you keep the pieces together, because you can't use glue on styrofoam, nothing works. And I have no idea where we found the site, look it up again. So I sorta forgot about it! But I see you pined it together, then I imagine that you just put the grout on over the foam and it makes all hold together huh? Did you have to use a special type of grout so it doesn't melt the styrofoam?
Way cute pics BTW!