Energy Waisted That Could Be Used

The sidewalks were recently fixed by our house. That got me thinking... Maybe they could come up with sidewalks that were solar powered?
With the technology we have now I know we can make them. Start with thick plastic see through yet rough enough so there is still some traction, that protect the solar panels underneath.
The roads would be next after it was perfected of course.
There are always smaller ways that maybe we could start with. Like pool covers if there isn't that already? Skateboards, decks, fences, even the top of every building around. All these things have energy, but aren't harnessed. This energy can then help your house or anything else you want. A solar universal plug if you will.