these are neato

With no external power requirements or wires whatsoever, you can’t find a simpler or more inexpensive way to illuminate dark walkways around your home or in your garden. Just replace standard bricks or pavers with our completely self-contained Sun Bricks.

Flush-to-the-ground, integral solar panels generate up to 8 hours of light each night. So guests can follow a cheerfully illuminated path to your door. Amber LED’s provide a warm, welcoming glow, consume little power, and can’t burn out.

Sun Bricks come on automatically when darkness falls, and incur no operating costs. Just recess them in your walkway, and forget them!
available for 59.95 here
(i feel like i ought to get some moola for this ad-they can afford it at 60$ a brick, but, oh well, what a fancy brick)