Christmas Lights

I see a lot of Christmas decorations and lights. It seems to be getting to be more and more each year. I do remember the oil crisis back in the early 70's. At that time, everyone (or at least a lot of people) stopped using Christmas lights as their way of contributing to easing the oil shortage and the energy crisis.
Now, it seems to be business as usual. I know that the new LED lights are supposed to use only about a quarter of the energy of the regular lights.
As I was driving home last night, I'm thinking, "When are they going to come up with solar Christmas lights?"
Did a Google search today, and sure enough, they've been working on them, and I see that they are now starting to be available.