Logs and driftwood is an option that adds a very natural look to any water feature.          
Waterfalls cascading over or under a log gives a lot of character and is an interesting look.                   Placing irregular shaped logs or driftwood in a stream or a waterfall enhances the realistic
appearance, simulating something you would see in a forest in nature.

 

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Logs & Driftwood 

   A Log by a water feature adds a very natural look,

  resembling a waterfall you would see out in nature.