Happy Blackout from Stiletto Design is a stainless steel light bulb holder that you attach to the wall. Insert a (preferably used) light bulb and it's good to go.
Notice the business end of the light bulb is still exposed. Light a small candle hidden behind that bulb, and whaddaya know? Looks like the bulb's lit, but no electricity's needed. Someday, all houses will be lit this way.
How many dead light bulbs does it take to have a happy blackout? [HippyShopper]