Hi, it could be nice if we can customize the color of the portal frame as in the april fools update. I have no idea if it's possible. Just saying. Have a nice day :)

That isn't a plugin feature as opposed to possibly a data pack. I may be able to look into how that works but it's not a plugin only feature as far as I am aware. I'll reopen this if I can find a way to add extra stuff on top but its not really a priority to add extra content like this for now as its technically external to the portal plugin itself and a separate project.