Turning sun into light (in a cute little jar)

What do you get when you put a solar cell, a rechargeable battery and LED lights into a Mason jar? Why, a Sun Jar, of course. You set the jar in a sunny window and when night falls, the jar automatically lights up. While it doesn't appear bright enough to read by, it makes a nice nightlight or alternate candlelight. And if you don't want to spend $40 for it, you can make one yourself. Not Martha made one for a little more than $13. Afternoon project? Very cool gift? I'll take one!