An inspiring project used plastic bottles filled with water (and a little bleach to stop algae growth) to spread light into the homes of people who cannot afford electricity in the Philippines. Link
The high-tech equivalent is solar tubes, particularly ones which offer integrated LED lighting and daylight dimming.
The benefit of these products is that spaces deep in the interior of a building can receive natural light during the day, saving electricity. Many of these products include daylight dimming so that you can effectively 'switch off' the daylight if you needed the room to be dark, and also light sensors and built in LED lighting, so that as the daylight fades, the LED lighting switches on and becomes brighter as the daylight diminishes.
The disadvantage is that you have to accommodate for the bulky tubes, which in an attic space is manageable, but running them to lower floors of a building required the tubes to be hidden within cupboards or similar.
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