public class LayoutElementFactory : IElementFactory  

//Create a simple 2D point graphic and apply an existing point style item as the symbology.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2D point geometry  
  Coordinate2D coord2D = new Coordinate2D(2.0, 10.0);

  //(optionally) Reference a point symbol in a style
  StyleProjectItem ptStylePrjItm = Project.Current.GetItems<StyleProjectItem>().FirstOrDefault(item => item.Name == "ArcGIS 2D");
  SymbolStyleItem ptSymStyleItm = ptStylePrjItm.SearchSymbols(StyleItemType.PointSymbol, "City Hall")[0];
  CIMPointSymbol pointSym = ptSymStyleItm.Symbol as CIMPointSymbol;
  pointSym.SetSize(50);

  //Set symbolology, create and add element to layout

  //An alternative simple symbol is also commented out below.  This would elminate the four 
  //optional lines of code above that reference a style.

  //CIMPointSymbol pointSym = SymbolFactory.Instance.ConstructPointSymbol(ColorFactory.Instance.RedRGB, 25.0, SimpleMarkerStyle.Star);  //Alternative simple symbol
  GraphicElement ptElm = LayoutElementFactory.Instance.CreatePointGraphicElement(layout, coord2D, pointSym);
  ptElm.SetName("New Point");
});

//Create a simple 2D line graphic and apply an existing line style item as the symbology.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2d line geometry
  List<Coordinate2D> plCoords = new List<Coordinate2D>();
  plCoords.Add(new Coordinate2D(1, 8.5));
  plCoords.Add(new Coordinate2D(1.66, 9));
  plCoords.Add(new Coordinate2D(2.33, 8.1));
  plCoords.Add(new Coordinate2D(3, 8.5));
  Polyline linePl = PolylineBuilder.CreatePolyline(plCoords);

  //(optionally) Reference a line symbol in a style
  StyleProjectItem lnStylePrjItm = Project.Current.GetItems<StyleProjectItem>().FirstOrDefault(item => item.Name == "ArcGIS 2D");
  SymbolStyleItem lnSymStyleItm = lnStylePrjItm.SearchSymbols(StyleItemType.LineSymbol, "Line with 2 Markers")[0];
  CIMLineSymbol lineSym = lnSymStyleItm.Symbol as CIMLineSymbol;
  lineSym.SetSize(20);

  //Set symbolology, create and add element to layout

  //An alternative simple symbol is also commented out below.  This would elminate the four 
  //optional lines of code above that reference a style.

  //CIMLineSymbol lineSym = SymbolFactory.Instance.ConstructLineSymbol(ColorFactory.Instance.BlueRGB, 4.0, SimpleLineStyle.Solid);  //Alternative simple symbol
  GraphicElement lineElm = LayoutElementFactory.Instance.CreateLineGraphicElement(layout, linePl, lineSym);
  lineElm.SetName("New Line");
});

//Create a simple 2D rectangle graphic and apply simple fill and outline symbols.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2D envelope geometry
  Coordinate2D rec_ll = new Coordinate2D(1.0, 4.75);
  Coordinate2D rec_ur = new Coordinate2D(3.0, 5.75);
  Envelope rec_env = EnvelopeBuilder.CreateEnvelope(rec_ll, rec_ur);

  //Set symbolology, create and add element to layout
  CIMStroke outline = SymbolFactory.Instance.ConstructStroke(ColorFactory.Instance.BlackRGB, 5.0, SimpleLineStyle.Solid);
  CIMPolygonSymbol polySym = SymbolFactory.Instance.ConstructPolygonSymbol(ColorFactory.Instance.GreenRGB, SimpleFillStyle.DiagonalCross, outline);
  GraphicElement recElm = LayoutElementFactory.Instance.CreateRectangleGraphicElement(layout, rec_env, polySym);
  recElm.SetName("New Rectangle");
});

//Create a simple point text element and assign basic symbology and text settings.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2D point geometry
  Coordinate2D coord2D = new Coordinate2D(3.5, 10);

  //Set symbolology, create and add element to layout
  CIMTextSymbol sym = SymbolFactory.Instance.ConstructTextSymbol(ColorFactory.Instance.RedRGB, 32, "Arial", "Regular");
  string textString = "Point text";
  GraphicElement ptTxtElm = LayoutElementFactory.Instance.CreatePointTextGraphicElement(layout, coord2D, textString, sym);
  ptTxtElm.SetName("New Point Text");

  //Change additional text properties
  ptTxtElm.SetAnchor(Anchor.CenterPoint);
  ptTxtElm.SetX(4.5);
  ptTxtElm.SetY(9.5);
  ptTxtElm.SetRotation(45);
});

//Create rectangle text with background and border symbology.  

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2D polygon geometry
  List<Coordinate2D> plyCoords = new List<Coordinate2D>();
  plyCoords.Add(new Coordinate2D(3.5, 7));
  plyCoords.Add(new Coordinate2D(4.5, 7));
  plyCoords.Add(new Coordinate2D(4.5, 6.7));
  plyCoords.Add(new Coordinate2D(5.5, 6.7));
  plyCoords.Add(new Coordinate2D(5.5, 6.1));
  plyCoords.Add(new Coordinate2D(3.5, 6.1));
  Polygon poly = PolygonBuilder.CreatePolygon(plyCoords);

  //Set symbolology, create and add element to layout
  //Also notice how formatting tags are using within the text string.
  CIMTextSymbol sym = SymbolFactory.Instance.ConstructTextSymbol(ColorFactory.Instance.GreyRGB, 10, "Arial", "Regular");
  string text = "Some Text String that is really long and is <BOL>forced to wrap to other lines</BOL> so that we can see the effects." as String;
  GraphicElement polyTxtElm = LayoutElementFactory.Instance.CreatePolygonParagraphGraphicElement(layout, poly, text, sym);
  polyTxtElm.SetName("New Polygon Text");

  //(Optionally) Modify paragraph border 
  CIMGraphic polyTxtGra = polyTxtElm.Graphic;
  CIMParagraphTextGraphic cimPolyTxtGra = polyTxtGra as CIMParagraphTextGraphic;
  cimPolyTxtGra.Frame.BorderSymbol = new CIMSymbolReference();
  cimPolyTxtGra.Frame.BorderSymbol.Symbol = SymbolFactory.Instance.ConstructLineSymbol(ColorFactory.Instance.GreyRGB, 1.0, SimpleLineStyle.Solid);
  polyTxtElm.SetGraphic(polyTxtGra);
});

//Create a picture element and also set background and border symbology.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2D envelope geometry
  Coordinate2D pic_ll = new Coordinate2D(6, 1);
  Coordinate2D pic_ur = new Coordinate2D(8, 2);
  Envelope env = EnvelopeBuilder.CreateEnvelope(pic_ll, pic_ur);

  //Create and add element to layout
  string picPath = @"C:\Temp\WhitePass.jpg";
  GraphicElement picElm = LayoutElementFactory.Instance.CreatePictureGraphicElement(layout, env, picPath);
  picElm.SetName("New Picture");

  //(Optionally) Modify the border and shadow 
  CIMGraphic picGra = picElm.Graphic;
  CIMPictureGraphic cimPicGra = picGra as CIMPictureGraphic;
  cimPicGra.Frame.BorderSymbol = new CIMSymbolReference();
  cimPicGra.Frame.BorderSymbol.Symbol = SymbolFactory.Instance.ConstructLineSymbol(ColorFactory.Instance.BlueRGB, 2.0, SimpleLineStyle.Solid);

  cimPicGra.Frame.ShadowSymbol = new CIMSymbolReference();
  cimPicGra.Frame.ShadowSymbol.Symbol = SymbolFactory.Instance.ConstructPolygonSymbol(ColorFactory.Instance.BlackRGB, SimpleFillStyle.Solid);

  //Update the element
  picElm.SetGraphic(picGra);
});

//Create a map frame and set its camera by zooming to the extent of an existing bookmark.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2D envelope geometry
  Coordinate2D mf_ll = new Coordinate2D(6.0, 8.5);
  Coordinate2D mf_ur = new Coordinate2D(8.0, 10.5);
  Envelope mf_env = EnvelopeBuilder.CreateEnvelope(mf_ll, mf_ur);

  //Reference map, create MF and add to layout
  MapProjectItem mapPrjItem = Project.Current.GetItems<MapProjectItem>().FirstOrDefault(item => item.Name.Equals("Map"));
  Map mfMap = mapPrjItem.GetMap();
  MapFrame mfElm = LayoutElementFactory.Instance.CreateMapFrame(layout, mf_env, mfMap);
  mfElm.SetName("New Map Frame");

  //Zoom to bookmark
  Bookmark bookmark = mfElm.Map.GetBookmarks().FirstOrDefault(b => b.Name == "Great Lakes");
  mfElm.SetCamera(bookmark);
});

//Create a legend for an associated map frame.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2D envelope geometry
  Coordinate2D leg_ll = new Coordinate2D(6, 2.5);
  Coordinate2D leg_ur = new Coordinate2D(8, 4.5);
  Envelope leg_env = EnvelopeBuilder.CreateEnvelope(leg_ll, leg_ur);

  //Reference MF, create legend and add to layout
  MapFrame mapFrame = layout.FindElement("New Map Frame") as MapFrame;
  if (mapFrame == null)
  {
    ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("Map frame not found", "WARNING");
    return;
  }
  Legend legendElm = LayoutElementFactory.Instance.CreateLegend(layout, leg_env, mapFrame);
  legendElm.SetName("New Legend");
});