Cheap TrickJulie and Scott Borchardt of Walpole yearned for a stone fireplace. But in an existing house, constructing a fireplace with natural stones, which are heavy and messy to work with. So the Borchardts settled on Owens Corning Cultured Stone. It was important to them that the stone be realistic. The faux stone they chose comes in more than 25 styles and almost 100 colors, says Brendan Mostecki of Cultured Masonry in Leominster. Plus, the $25 to $50 per square foot for materials and labor on Cultured Stone projects is half that of natural stone.