I demolished one of those garden solar lights. Available for 50p in any cheap shop, or for free from a neighbour's garden. 

Who needs lights at night? Take out the tiny battery and control circuit. All we need is the solar panel and an LED. 

Once you have the solar panel and LED, solder them together. Ideally make the LED point the same way as the solar panel, for maximum sun torch effect. 

Hopefully it's sunny. Point it at the sun. Does the sun suddenly get a little brighter? Congrats, you've successfully helped brighten someone's day.