For a short time, our local supermarket supplied its pre-packed meat on plastic trays with a reverse embossed hex pattern, about 3/4 of a cm across. I saved a few once I found that out, as at that time, I was looking for much the same as you; a source of a futuristic (Infinity) pattern for use as pavement on a table.
I never nearly got enough of the trays for even a 3x3 table before they changed the trays back to styrofoam, but I've held on to the ones I have, to perhaps use them to make some dental plaster moulds.
The search was halted at some point, but I've bookmarked all of the above suggestions, for when I get on with that project again...