Okay, so there are a LOT of good tutorials that go into depth about themes and styles and what have you, but I've noticed that none of them give you a 2-minute quick-and-dirty on how to simply alter the boot image.
(This is probably what you're after if you wanna, say, brand all the company computers. Or mess with your friends.)
First, back up the following directory to... somewhere else:
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/lib/plymouth/themes/ubuntu-logo/
Go in and replace the PNG files with the ones you have created, BEING CERTAIN that they are encoded the same (I.E. if the old one was 16-colour, you need to be sure YOURS is resampled to 16-colour). Sizes aren't crucial for the logo,although you'll want to keep it within reason, although I've tested it with a HUGE image (which simply goes off the top of the screen) and I haven't tried altering the image size on the filler dots, but I'm assuming you probably have a little leeway there, too.
Finally, when you're done altering the artwork, pop into the terminal and run:
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sudo update-initramfs -u