Twilight Dye

This is one of the Strange Plant dyes, so it cannot be bought or crafted. You find the plants growing on the surface and hand them to the trader, who gives back whatever he feels like, which means chasing a specific dye is a patience exercise.

The effect is a moving night sky rather than a flat color, and it scrolls as you move. It reads best on large unbroken areas like a cape or a full robe, and gets lost on small accessories where there is not enough surface for the pattern to register.

Put it on a minecart and the animation runs backward while you travel left, which looks wrong once you notice it and invisible until you do. It also erases the rocket particles on Yoraiz0r's Spell, which is either a thing to work around or exactly the look you were after.