I've been trying to change the theme to a backgound and font colors on openSUSE but, haven't quit gotten there yet.

In /etc/default/grub I commented out the theme and added a background but, nothing changed. I still had a theme.

Took a look at /etc/grub.d/00_header and seen that is where the theme is coming from. So, I'll have to do some more research...

I've never seen a file like 00_header on any other Linux system so far. But, nothing is impossible.

Lemme see...