Are you talking about motherboard's the spash page? The very first thing that comes up when you turn the computer on? Or the spash page to the OS? I think you can easily change the spash page of the OS if you have Linux. Not some much on Windows.
If you're talking about the motherboard's splash page, I think that's a really narrow question and it comes down to your motherboard. I've never done it myself but I'm sure it can be done if your motherboard supports it. Figure out what motherboard you have and Google something like "(your motherboard model) change splash page." I'm sure somebody has tried it before.