The way I hid the liner is to build a "rock shelf". It was about 4"
lower than the top of the pond. I put the big moss rock boulders on the
shelf and filled the pond so that the rocks were part submerged in the
water. On the top of the pond, I covered the liner with smaller rocks.

Works great. I only see liner when the water gets WAY too low.

-ikiru

*enjoy the sauce*