Play with gravity
World link: Here!
This was actually the first VRChat world I ever created. I experiment with using U# to code up a physics simulation, and ended with a N-Body simulation of gravity.
If you pick up any of the small moons at spawn and let go of it, it will start moving according to the laws of gravity, which means falling into planet a bit away from it and being destroyed. What you need to do is throw it sideways, giving it enough momentum to reach orbital velocity. Do this with multiple moons, and they start affecting each other with their gravities, influencing their orbits. The result is often chaotic, but beautiful.