Pond Liner Disguise Ideas

Phase II of the pond is dug and filled...but, more than a year later, the vast majority of the liner has yet to be hidden.

For a while now, I have thought of hiding the liner in various ways to make it look as natural as possible--this particular spot, I would like to make look as though the water has carved it's way under a rock.  Before I forget (which I doubt I will), I thought I'd better post this as inspiration (although, the final version will look quite different, I am sure).