Regardless of the ongoing controversy, the poster stated that she had
already tried that route and didn't want to do it again, based on her
own experience. Which, btw, is the best way for ponders to decide
these disputed methods - not necessarily by their own mistakes, but at
least by being able to observe for themselves the results. I don't
understand wanting to decorate the bottom, since it will be covered
with beneficial algae soon, anyway, but some pond store, somewhere
probably sells it. I know someone on this group posted about using a
liner that was printed like rock, some years back. That might still be
available and a Google search might pull it up. If I wanted to use it
for that purpose, I guess I would just cut a piece the right size and
shape to cover the bottom and use big rocks to anchor it down in the
corners and at each side's midpoint. If they were fairly big, they
wouldn't act like the rocks that people put on their pond bottoms to
mimic a natural pond. Hope you find what you are looking for.