That's exactly what came to my mind, so we're on the same page!
Viewing post in KR Sun and Moon Palace Tileset for RPGs comments
That's actually a big surprise for me, but hey if it ever happens then I'll definitely buy the tileset itself for what it's worth, and use that as the Moon World of my game "Nightblade Mystic Adventure" which was originally planned to have a Moon themed World.
What about a "Underworld" tileset as well, like the Underworld similar to that of Final Fantasy II (SNES)/Final Fantasy IV (DS)?