I made the rock for the waterfalls out of a large pc of Styrofoam I found at a thrift shop. I placed some wicker baskets upside down and topped it all off with great stuff foam. I also made holes for the pump hoses by placing cut PVC and again covering them with great stuff foam. After all was dry I carved shapes and painted with a sponge. Added some succulents. The liner is a new 15 ft swimming pool replacement liner I bought from Amazon for $35.00. I had to fold it in half it was too big. Worked Great...!