I am re-laying and expanding an old blue stone patio. Much of it was torn up durring some construction. The stones are various size rectangles. Is there a standard pattern for laying these blue stones? Trying to do it like a jigsaw puzzle is not practicle since many are large and heavy. The other option is to find a computer program like is used to optimize cut-outs from a sheet of plywood. A program that would let me define an area, input all the stones I have by size, and then let it fit the stones by trial and error. My back and I would appretiate any help on this. Thanks.