Replications Unlimited. Urestone synthetic stone panels are suitable for interior and exterior uses such as wine cellars and outdoor kitchens, according to the manufacturer. The company says the panels, constructed with a solid plastic surface and a polyurethane foam backing, are easy to install and lighter than ½-inch plywood. They are molded from real stone, brick, and wood to offer a realistic appearance. 314.524.2040. www.replicationsunlimited.com.