Proline Decorative Concrete Systems CS100F 20" x 44" Old Cobblestone Thinflex Concrete Stamp. Old Cobblestone has the look of an Old World classic. The stones run in a running bond or offset pattern. There is a variant in the size of the stones with the largest stone measuring 5 Inch x 8 1/2 Inch. This pattern can be widely used for driveways, patios, walkway and interiors.