just found this on pinterest it may already be on here but looks like an awesome idea! I'm going to try this when i have the $ to invest in it, Looks like it could be really cool for daily use in a kids room too as a night light or something. One of the pinterest comments suggested for use as a cute lamp buy those clear glass pebblesand a cheep mirror, put the miror on the bottom of the ja and the pebbles on top and it will multiply the light.
http://campwander.blogspot.com/2012/07/elk-camp-solar-lanterns-provisions.html
http://campwander.blogspot.com/2012/07/elk-camp-solar-lanterns-provisions.html