These solar-powered string lights are available in green and white. Since they aren't tethered to an outlet, they can be used virtually anywhere.
Use them in your yard all year-round to light up a favorite tree, outline an arbor, or wrap a porch railing. Each string is 36 feet long and has 102 LED bulbs with built-in diffusers that last indefinitely.
Day/night sensor turns them on automatically. According to the manufacturer, lights run eight hours on a full charge.
Note, the reviews on this product are mixed. Some shoppers have loved them, some not so much.