Daniel Moth has blogged about the new SystemIcons.Shield icon added to the set of System.Drawing.SystemIcons collection. This new Shield icon can be used to display whenever an admin task is required to be carried out. You would be familiar with this icon if you are using Vista. For example – If you open the Indexing Options dialog box in Vista,
You can see the Advanced button has the Shield icon in it which indicates that it would be an admin task.
You can refer to Daniel’s post on how to add the Shield icon to Windows Forms application
If you want to add to an Image control in a WPF application, all you have to do is set the Image’s Source property to a BitmapSource. You can create the BitmapSource object from an Icon as shown below 
BitmapSource source = System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon
(SystemIcons.Shield.Handle,
Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
this.MyImage.Source = source;
And you can see something similar,
