Find a grub theme you like and more importantly you understand.
Do you need a PKGBUILD or can you build your own PKGBUILD?
We check the AUR to see what is out there.
There are a lot of grub themes all coming from one person.
We have choosen from something else.
We show you the complete workflow how to proceed
Creating github project.
Building the package.
Editing the package.
Putting it on the repository.
Add it to the iso.