Hang a mirror up on the wall to return the lamp's reflection. It will make the space seem larger by offering the illusion of two lamps instead of one and also bounce the light back off into the room if the lamp is farther away.
Hang up a string of prisms or a sun-catcher to utilize the lamp's reflection in a way that brings more color and sparkle into the room. Choose an elaborate permanent piece made out of crystal, or make your own. Change it out with the season, such as a sun-catcher in the shape of a turkey for fall or a string of red and green prisms for Christmastime.
Hang up a favorite painting or a photograph directly in the reflection of the lamp to highlight your artwork and make it a focal point in the space. Not only will the lamp supply needed light for a room, it will double-duty as accent lighting, as well.
Hang up a caricature if the reflection of the lamp on the wall casts a shadow rather than light. Use black construction paper to create your own cutouts that are the same size and scale as the shadow. It will add visual interest and texture to what is otherwise just unused dark space.
Paint a matching image onto the wall for a dramatic touch. Options include creating a mirror image or painting the characteristics in an opposite way. Use glow-in-the-dark paint to create a mural that changes visually as soon as you turn the lamp on at night.