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.