On waxed paper or plastic wrap, roll out a thin (1/8 inch) layer of Creative Paperclay. Cut the paper clay in to one inch wide strips. Apply pva (white or craft glue) to the Gatorfoam foundation below the porch on the front and sides of the porch. Place the strips of paperclay along the foundation, pressing them down into the glue. Wipe off any excess glue which squeezes out.
Use a toothpick or a clay modelling tool to create rough stone shapes in the paperclay. These shapes should be roughly round, in two layers, with the top layer overlapping the gaps in the stones of the row below. When you have the rough shapes drawn in the paperclay surface, use a craft stick or modeling tool to push some of the paper clay towards the centre of each stone. Add extra bits of paperclay to each stone if necessary. The stones should be fairly flat, only rounded on the edges.When you have the stones a good rough shape (see photo) use the end of a small paint brush or a toothpick to create smooth pointing lines between the stones to represent the cement which holds them. Don't worry if the stones have lines or cracks, that will add to the effect. Leave the paperclay to dry. When the clay is dry, buff and smooth the surface of your foundation stones with a damp paper towel. Fill in any cracks which have formed as the stones dried. Leave the stone foundation to dry completely.