I always needed a nightlight when I was a kid. So I still kinda like to have one nowadays. At least in the bathroom people! Insert a photograph, an image, art, or anything into the 3" square casing and you're nighttime will be a little bit brighter in no time.
I think this would be a great gift for a child - fill the slot with a drawing, photo, or piece of decorative paper and the light from behind turns it into an instant personalized nightlight. Brilliant.