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If you are going to use it as a wading pool you will need to consider a filtration system at the bottom. You may want to consider an EPDM liner for the rectangular section and one of the round tubs cut in half for the rounded ends. Investigate whether you can bond the EPDM to fiberglass, I know you can bond it to itself.
From there you can partially excavate the wading/reflecting pool and build up the outside retaining wall using landscape stones, field stone, etc. The liner will go partway up the built wall and then tuck in between two layers of the block.
You can install a bottom mount fitting for the plumbing in the EPDM liner.
After that you can put crushed colorful stone or river rock on the bottom to dress it up. I don't think you'll find any other color than black. River rock would probably be more forgiving on the feet of your grandkids.
Check out landscape supply houses and water garden supply houses for more ideas.
The projects you've posted have been beautiful, I am sure you can come up with a creative solution for this.
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