I've converted some Arch Linux stuff to fits Artix:
XScreensaver Artix Logo
Plymouth-Theme-Artix-Logo-New
Plasma bootsplash: Artix Logo Black
The plasma bootsplash is available at KDE Store, there's also an
Arch Linux Version.
Update: There's also a manjaro plasma bootsplash
here. Same as the other ones, it's available at KDE Store.