Just one evening by candlelight makes you think of past centuries when candlelight was the only light available, and people read by it, and tried to sew and study by it. It also makes me think of the hospital ward in Malawi which a friend recently visited, where babies are born by candlelight if the mother can afford to bring a candle!
An inspiring video shows an ingenious use of plastic bottles to bring daylight into dark places (only in daytime of course). Click here to watch www.youtube.com/watch?v=hkVLjQ61zYw&feature=related
www.ecoideas.net is interesting too.