public CIMPolygonSymbol ConstructPolygonSymbolWithPenInkRipple( 
   CIMColor color
)

/// <summary>
/// Constructs a polygon symbol in the specified color representing a pen and ink ripple water fill. See https://www.esri.com/arcgis-blog/products/arcgis-pro/mapping/please-steal-this-pen-and-ink-style/
/// ![polygonRipple.png](https://ArcGIS.github.io/arcgis-pro-sdk/images/Symbology/polygonRipple.png)
/// </summary>
{
  //Note: Run withing QueuedTask
  //Ripple pen and ink
  var penInkRipple = SymbolFactory.Instance.ConstructPolygonSymbolWithPenInkRipple(CIMColor.CreateRGBColor(13, 24, 54));
  CIMPolygonSymbol penInkRipplePolygonSymbol = penInkRipple;
  //To apply the symbol to a polygon feature layer
  //var renderer = theLayer.GetRenderer() as CIMSimpleRenderer;
  //renderer.Symbol = penInkRipplePolygonSymbol.MakeSymbolReference();
  //theLayer.SetRenderer(renderer);
}