I presently have a Koi pond with a black liner. I covered the bottom and sides with rocks to make it look natural but is a lot of work and maintenance. I plan to do a once a year complete clean-up and I am looking for a liner or plastic to go over the liner that would have graphics showing rocks, sand, etc. so I don't have to put rocks inside the pond any longer. Anyone have seen such a product? If not maybe a light blue liner (instead of black).