"Hokey Spokes" is a thing with which you will feel safe at night (if you ride a bike, of course), and, most importantly, which will invariably delight you every time you look at it.
According to www.hokeyspokes.com, these are unique bicycle safety lights that allow cyclists to display computer generated images and inscriptions during night walks instead of the usual flickering of wheel spokes. They serve not only for fun, but also perform a very important function for the cyclist: with such lights on the night track you can be seen from afar, which cannot be achieved with ordinary bicycle headlights.
Hokey Spokes can reproduce lettering and even advertisements and is powered by those AAA batteries.