Update April 24, 2015
This project is no longer shown on her site but her current work is interesting. I think she is using a synthetic stucco material.
This sculpture project by artist Faith Schexnayder was my favorite episode of HGTV's That's Clever. Faith carved the shape from dense foam, spread on a layer of cement mixed with fiberglass fibers and then created the mosaic. Faith also makes all kinds of outdoor sculpture, signs and props with this technique. Not all get the mosaic treatment and it was the foam and cement that captured me. There is a tutorial online for this quilt and Faith keeps a website for her business, Flatfork Studio. My favorite section of her site is the Architectural Carving done in foam and cement.