Mac 10.7: Change boot screen?

Hello,

I've, of course, a question:

How do you change the boot (or startup) screen background, on Mac 10.7?

With the boot (or startup) screen background, I mean that dull, grey color that appears when you start your computer

I read about it, in an internet article, but now I can't find it anymore...

I remember these things had something to do with:

• There was a plist, deep stored inside the mac files (Probably somewhere in /System/blabla/blabla/blabla, ect.)
• In that plist you had an subcategory, that was named something like "Frenchblue", or something that had "Grey" in it
• In that subcategory where three keys which value were numbers, because together they where a RGB color (that holded the grey boot screen color)

Do you understand me?

I need to know where that plist is, which holds the RGB color for the boot background...

Unfortunately for you, I've, of course, another question (which is easier):

How do you change the applelogo that appears in the boot (or startup) screen, on Mac 10.7?
Please don't say BootXchanger, because this doesn't work for mac 10.7!

I guess this is just a picture, deep inside the mac system files...

Thanks in advance,

Isaiah v. Hunen

P.S. I really need your help...