Light up your walkway with glow in the dark pebbles. Not only will these glowing rocks help to illuminate your walkway, but you'll also be able to freak out your neighbors when they fear you are using radioactive material to light up your yard.
Accordingly, they could also be a good way to frighten away that unwanted pesky neighbor who keeps showing up at your door uninvited.
Implications - In the daytime the pebbles just look like ordinary stones. The glow-in-the-dark pebbles are solar powered, so if it is a rainy day they may not glow as brightly at night. If the sun fully charges the pebbles they can glow for up to six hours at nighttime.