GHacks.net shows you how to change the Grub splash screen in Ubuntu

Your first question might be “Why bother changing your grub splash screen?” The answer? Why not! Well, actually there are plenty of reasons you might want to change your Grub splash screen. You could be in a company that wants its brand from top to bottom, or you just want your computer to be cool from boot to desktop.

Whatever reason you have for wanting to add a nifty splash screen to Grub, you can. There is no “handy” GUI application for this, so you are going to have to issue a few commands. NOTE: This is something you should undertake ONLY if you know what you are doing. One mistake with Grub and your machine could be rendered unbootable. You’ve been warned. NOTE: I will show how to do this in both Grub and Grub2

  Change your Grub and Grub2 splash screen in Ubuntu