I didn't think it was possible, but smargroth (the creator of the WPF/E Vista example) has posted in the forums about how to simulate 3D objects in WPF/E. You can view his example here. The example isn't perfect, but he explains that it will be fixed once frustum clipping is added (I really miss frustum clipping (what IS frustum clipping???)).
He has even posted some example javascript which you can use to create your own 3D objects in WPF/E. He leaves the task of lighting and coloring to the reader, but gives a hint that you can accomplish it with an opacity mask. I think I need to go buy a book so I can learn about all this graphics stuff. Any suggestions?