Hollandstone Hollandstone has the renowned durability of Unilock interlocking paving stones yet offers the old world charm of a simple brick shape in paving. A dry cast paving stone so astonishingly simple in design yet capable of meeting the demands of architects and interior designers for beautiful yet everlasting textured paving surface. This simple rectangular stone can be applied in a number of fascinating patterns to produce warm, luxurious textures.