Display FontAwesome-Icon in Image

Hi experts,
I know how to display FA-Icons (e.g. in Labels).
Now I need (for reasons of simplicity) to display an FA-Icon using an Image. As all FA-Icons are resources this should work fine, right?

      Resource resource = FontAwesome.ADJUST;
      Image image = new Image("no image visible", resource);

But this displays no image. Using Vaadin 7.7.10.

Any ideas?