Hey folks,I came up with the attached after a couple days' work. Let me know what you think! I attached the artwork as well as the xpm.gz. Copy it over to /boot/grub and rename it splash.xpm.gz (back up yer old one if you want) and reboot to check it out in action.
One thing to note, I did this by indexing the inkscape-exported full-color artwork in the gimp, and indexing down to 14 colors. That was it. I remember in the past having to add black and white to colormap slots 0 and 1 respectively, but grub seemed to not like that this time. If you just use the 14 color pixmap, grub seems to deal with it just fine.
Description: GNU Zip compressed data