ok, the floor idea is really cool if you have a lot of pennies, or better buffalo nickels. LOL now that would be neat. You would have to find a way to cover them with a clear laminate. Shellac wouldn't work unless it was a lot and filled the crevices of the coins. I would think someone at a carpet store would be more qualified to figure this out. What a neat project for a weekend CRH warrior.
Sincerely, GarouLady