Best option is probably to create a Plymouth theme. It's not too difficult to modify someone else's theme and put your own colors and graphics into it, but creating your own, to my knowledge, requires programming it in C. If you do a quick google search for "plymouth theming," you should find a good amount. I am not knowledgeable enough to give you specifics--I've only modified someone else's theme. Hopefully that helps you find the way, though.
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