Added patches 7389 and 7421 submitted by lckuiper. These patches contains support for Cell Margins and Table\Cell borders.

Thank you for sharing your custom features with the group lckuiper.

DocX/Border.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Drawing;
+
+namespace Novacode
+{
+    /// <summary>
+    /// Represents a border of a table or table cell
+    /// Added by lckuiper @ 20101117
+    /// </summary>
+    public class Border
+    {
+        BorderStyle tcbs;
+        Color color;
+        BorderSize size;
+        int space;
+
+        public BorderStyle Tcbs
+        {
+            get { return tcbs; }
+            set { tcbs = value; }
+        }
+
+        public BorderSize Size
+        {
+            get { return size; }
+            set { size = value; }
+        }
+
+        public int Space
+        {
+            get { return space; }
+            set { space = value; }
+        }
+
+        public Color Color
+        {
+            get { return color; }
+            set { color = value; }
+        }
+
+        public Border()
+        {
+            this.tcbs = BorderStyle.Tcbs_single;
+            this.size = BorderSize.one;
+            this.space = 0;
+            this.color = Color.Black;
+        }
+
+        public Border(BorderStyle tcbs, BorderSize size, int space, Color color)
+        {
+            this.Tcbs = tcbs;
+            this.size = size;
+            this.space = space;
+            this.Color = color;
+        }
+    }
+}

DocX/DocX.csproj

     </Reference>
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Border.cs" />
     <Compile Include="Container.cs" />
     <Compile Include="Footers.cs" />
     <Compile Include="Footer.cs" />

DocX/_Enumerations.cs

 
 namespace Novacode
 {
+    public enum BorderSize
+    {
+        one,
+        two,
+        three,
+        four,
+        five,
+        six,
+        seven,
+        eight,
+        nine
+    }
+
+    /// <summary>
+    /// Table Cell Border styles
+    /// Added by lckuiper @ 20101117
+    /// source: http://msdn.microsoft.com/en-us/library/documentformat.openxml.wordprocessing.tablecellborders.aspx
+    /// </summary>
+    public enum BorderStyle
+    {
+        Tcbs_none = 0,
+        Tcbs_single,
+        Tcbs_thick,
+        Tcbs_double,
+        Tcbs_dotted,
+        Tcbs_dashed,
+        Tcbs_dotDash,
+        Tcbs_dotDotDash,
+        Tcbs_triple,
+        Tcbs_thinThickSmallGap,
+        Tcbs_thickThinSmallGap,
+        Tcbs_thinThickThinSmallGap,
+        Tcbs_thinThickMediumGap,
+        Tcbs_thickThinMediumGap,
+        Tcbs_thinThickThinMediumGap,
+        Tcbs_thinThickLargeGap,
+        Tcbs_thickThinLargeGap,
+        Tcbs_thinThickThinLargeGap,
+        Tcbs_wave,
+        Tcbs_doubleWave,
+        Tcbs_dashSmallGap,
+        Tcbs_dashDotStroked,
+        Tcbs_threeDEmboss,
+        Tcbs_threeDEngrave,
+        Tcbs_outset,
+        Tcbs_inset
+    }
+
+    /// <summary>
+    /// Table Cell Border Types
+    /// Added by lckuiper @ 20101117
+    /// source: http://msdn.microsoft.com/en-us/library/documentformat.openxml.wordprocessing.tablecellborders.aspx
+    /// </summary>
+    public enum TableCellBorderType
+    {
+        Top,
+        Bottom,
+        Left,
+        Right,
+        InsideH,
+        InsideV,
+        TopLeftToBottomRight,
+        TopRightToBottomLeft
+    }
+
+    /// <summary>
+    /// Table Border Types
+    /// Added by lckuiper @ 20101117
+    /// source: http://msdn.microsoft.com/en-us/library/documentformat.openxml.wordprocessing.tableborders.aspx
+    /// </summary>
+    public enum TableBorderType
+    {
+        Top,
+        Bottom,
+        Left,
+        Right,
+        InsideH,
+        InsideV
+    }
+
     // Patch 7398 added by lckuiper on Nov 16th 2010 @ 2:23 PM
     public enum VerticalAlignment { Top, Center, Bottom };