Following with the idea of creating a full theme for Igalia covering the whole artwork that is shown in a Gnome desktop. I’ve created a Debian package and a sample picture to place in the Grub2 splash, at the computer startup. I’ve uploaded it to a public Git repository which you can download with the following command:

$ git clone http://git.igalia.com/art/grub2-igalia-splashimages.git

You can create and install the Debian package with:

$ cd grub2-igalia-splashimages
$ dpkg-buildpackage -rfakeroot
...
$ dpkg -i ../grub2-igalia-splashimages*deb

In order to use any of the images in the package to show as Grub2 splash, you just have change a line like:

$ cat /etc/grub.d/05_debian_theme 
...
  for i in {/boot/grub,/usr/share/images/desktop-base}/moreblue-orbit-grub.{png,tga} ; do
...
  set color_normal=black/black
  set color_highlight=magenta/black
...

to

$ cat /etc/grub.d/05_debian_theme 
...
  for i in {/boot/grub,/usr/share/images/desktop-base,/usr/share/images/grub}/igalia_black.{png,tga} ; do
/some_file.tga
... 
  set color_normal=light-gray/black
  set color_highlight=white/black
... 

and run:

$  update-grub2