There are several attractive methods for hiding an exposed pond liner. One option is to use rocks or gravel to cover the edges of the liner, blending it seamlessly with the surrounding landscape. Select local stones that match the natural environment, placing them carefully to create a gentle slope that leads to the water's edge. A layer of smooth gravel (2-3 inchees deep) will help shield the liner from UV exposure. Gravel can be extended into the pond if the walls are sloped, using a curb or speedbump to keep the gravel from slipped to the bottom of the pond.
Another option is placing or planting native aquatic or marginal plants along the pond edges. Once established, the foliage will obscure the liner while providing a valuable habitat for wildlife. Consider using species like cattails or water lilies, which thrive in wet conditions and enhance the pond's ecosystem. Another option is to install edging materials, such as wooden or stone borders, which can frame the pond in a more formal fashion while concealing the liner.