18x18 Inch EnviroTile Cobblestone Grey - MT5000695 - Home Depot $7.99 Look like concrete pavers, have the ease of DIY application. Lightweight and portable, place directly on top of flat surface. Will not warp, crack, peel, ship or crumble. Secure tiles together with Connector Clips (sold separately). All-season and weather-resistant. To trim use heavy-duty utility knife or skill saw. Noise and impact-absorbing; prevent serious injuries with non-slip, impact-friendly surface.