This wallpaper is called "Many Earths." It pays homage to the many-worlds interpretation of quantum mechanics that the Planck-state phenomena concept somewhat relates to. It's a reminder that within the time frame it takes you to notice it—literally the short, fraction of a second it takes your eyeballs to move toward and focus on the picture—you have already experienced more Planck-state versions of Earth than all the Earths in the picture. In fact, you have experienced more Earths than the total number of Earths in the picture times itself.
The picture of Earth chosen (shown clearly in version 4; in version 3 it was dimmed) is less idealized and more realistic than most. If you look up photos of Earth, the vast majority of pictures are heavily enhanced, with exaggerated blues, greens, and browns. This picture of Earth is more congruent with the air and atmosphere's bluing haze of the planet when viewed from space. Most vivid Earth photos are composites, meaning they are a collage of separate photos of Earth not taken from a far enough distance to capture the whole globe—this one is not. More info about the photo here: https://www.nasa.gov/image-feature/nasa-captures-epic-earth-image
The overall concept behind this wallpaper is that you are constantly changing, and every moment is a new Earth experience for you. You can use it to remind yourself that the continuity in your reality is something being generated by you, and is a hallucinatory context being imposed upon the ever-changing now moment.
What are you choosing to do with your time on Earth, versus what you say you want to do?
What kind of Earth are you automatically, continuously helping to co-create?
What kind of Earth are you choosing to experience?
This simple wallpaper can help in subconsciously rekindling that flame of introspection, regarding why you are here where you are, and can act as a reminder that every moment you are a completely new you, inhabiting a completely new Earth.