how to hide the liner on a preformed pond?

[glassbird]

I have one (soon to be two) preformed ponds. The one that is currently installed looks great as long as the water level is all the way up, but if it goes down a few inches the rigid black plastic liner becomes visible and I have to drag out the hose.

I have been considering a product called "Rock on a Roll" which looks like a flexible liner but is rock colored...however, its expensive, and I am cheap! What else could I do? I am thinking about using silicone to "glue" rocks or pebbles along the top 5-6 inches. That might work, but will the silicone hold, especially with the harsh winters that we have in New England? Or maybe I could use the synthetic rock veneers that people use to reface an ugly fireplace. I have seen that item on TV...its supposed to be lighter than rock...price could be an issue, but I have not looked into it yet. And there is still the question of "glue"...

I can't be the only person to have this issue...

Suggestions, anyone? Thanks!
CT