Acker-Stone 2-139-06-06-114-00-00000 6cm Aviano 4 Piece Paver with Slate Texture Antique Pewter TM. Acker-Stone has replicated the classic look and feel of natural slate, but has further enhanced its appearance through the introduction of an excellent selection of rich color blends and popular shapes. All of which, allow for good number of attractive random laying patterns. This paver is great for use by pedestrians or in residential driveways, walkways, patios, courtyards, pool decks, outdoor kitchens and outdoor living spaces.