This is a paid asset, but now you can download Aethereal Planes Battlebacks for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Aethereal Planes Battlebacks Vol 1
Send your game to weird and wonderful new dimensions with these sixteen backgrounds and thirteen foreground layers from artist Joel Steudler! Suitable for sci-fi, fantasy, or whatever genre adventures into the unknown. These abstract visions of impossible places can be used as title screens, backgrounds, battlebacks, or however you please. The foreground elements for RPG Maker will keep your characters on relatively solid ground.
16 backgrounds formatted for RPG Maker MV/MZ, RPG Maker VX Ace, and Visual Novel Maker
16 high-res versions for you to use in any engine or modify in graphics software! (1920x1920px or larger for some backgrounds)
13 foreground layers formatted for RPG Maker MV/MZ and RPG Maker VX Ace
all graphics in .png format
musical theme ‘Planewalking’ in .ogg and .m4a format
use in any game engine or media projects (commercial or non)
sold under the Game Asset Bundle JSM License Agreement