hi hello! :3
arig and hyarion already have weather effects baked in (or have them enabled when you have celestial weather, i'll have to check), but i'll see if i can come up with anything interesting!
muluna was one i considered doing but it was hard to think of additional weather effects (aside from the really light dust from og celestial weather) that didn't make it feel like a planet instead of a moon, so if you have any ideas for that let me know!