Years ago, my Dad built a poured-resin bartop for a bar at a local marina restaurant, some 60 feet long.
It was very cool, it was meant to look like the ocean floor, had a bed of sand on the bottom, starfish, sand dollars, coral pieces, seashells, "gold" coins / lost "treasure", etc.
The owner of the bar had a check made out in the amount of One Million Dollars in there as well.
That was done by pouring half of the total bartop depth, then letting that cure, putting down the check (and other things like speeding tickets, IOUs, cash, etc) and then, pouring the rest.
All of the paper items were first laminated in a typical office-type laminator, as I recall. otherwise they didn't look too good once the resin got into them.