Wires and electricity freak me out. Maybe it's that one time I grabbed an electric fence when I was young. Reader Miguel obviously does not share my fear because he sent along a hack that makes the hairs on my arms stand up. If pictures like the following get you excited, a "Lumi Lock" type hack might be up your alley.
Miguel came up with a rather sophisticated way to try to increase visibility on the road. He wrote the following:
I recently made a Messenger bag that promotes bike safety through lights, and added feature of a bike lock. Perfect for commuters getting around the city, the messenger bag uses Arduino, 1w LED, and a cleverly designed switch that activates the lights.
He put up a full post on Instructables and also send along this video.