Not sure if this is the best spot to post this but ship, airship, boats, rafts etc which are a built in thing for RPG Maker MZ would be cool sprites to have to go along with all your other packs
Viewing post in Put Suggestions Here!
https://willibab.itch.io/willibabs-the-mighty-pack-addon-backgrounds Added some edited ones to this pack. Original pack has CC0 license so you can use them however you wish.