Ben Uyeda at HomeMade Modern has put together a how-to on creating a set of handsome concrete nesting tables using little more than a Lego brick mold and Quikrete Countertop Mix. And no, you don’t sacrifice the Legos. A little non-abrasive soap and water will have them back in action in no time. He says the project only cost him $15 in materials and 6 hours of his time.