I've taken the amazing work of AEVERNUM and CHARLIEHENSON and combined them, along with changes to the progress bar to give you this gorgeous boot screen. Make your Windoze friends super jelly ;)
How to Enjoy.
1.Unzip with software of Choice.
2.Copy output to /boot/grub/themes/ (or grub2 depending on distro)
3.Navigate to /etc/default/grub and edit or add the following lines GRUB_THEME=/boot/grub/themes/solarized-dark-materialized/theme.txt (again or grub2 depending on distro)
4.Update grub with grub-mkconfig -o /boot/grub/grub.cfg (and like a broken record, or grub2 depending on distro)