mosaics as well as split, cut and natural stone tile, a pattern is drawn and the pieces measured and fit to pattern. From there, adhesives and the like are used to permanently seat the pieces. Grout, epoxy or other fillers are used to fill any gaps or spaces and the result is amazing! An overall sealant coat or non-cycloaliphatic epoxy resin is an option
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swathes of such mosaics would be welcome if the plants grow up onto the edges. less grass. use polymeric sand. This sand contains polymers so that you don't have weeds growing up between the gaps. I love this stuff and highly recommend it. It becomes so stiff it feels like concrete, yet the water can still penetrate to drain off.