Find a shop that does carved carpet and have them make an inlay. Friend of mine used to do it years ago. Logos, family crests, whatever you wanted. He would do the inlays them hand bevel/trim. Had quite the business.
Or....find a shop that does the composite boat mat(?). Not sure what it's called exactly(dang old brain) I've supplied files so the company could waterjet the different colors and assemble.
Stuff is made to last outside in all conditions.