The bios is on and off so quickly, I chose to skip it. I let the bios do it's thing and I skinned the boot screen and the welcome screen.
So my computer goes...
Windows XP loading screen, Which I have set to show WIndows XP Homer's Edition with a picture of Homer Simpson instead of the Windows logo
Welcome screen, which is a picture of an E46 M3
This way you still get your logos and take zero risk of screwing your BIOS. At worst you screw up your boot.ini file and have to reset it.