Download the ShowIcons.pub to show icons. You need to have your macro security set to medium to use this publication. Open up the Visual Basic Editor, and in the Immediate window, type "ShowIcons(X)", where X is an integer greater than zero. This will show a set of 50 icons on a toolbar called "Set X" (X is the number you specified). Hovering over the icons gives their FaceIDs, which you can use in your code.
Get ShowIcons.pub here