Apple Logo @ Boot
 

When OSX first boots, I see a light gray background with a darker gray Apple in the center.

Where is it?
How do I change this?
How do I set it as my background?

You can achieve this on genuine Macs by using BootXChanger. There are a couple of threads within this board discussing issues with the software on hacks.

Chameleon 2.0
 

If you use chameleon 2.0 bootloader, all you need to do is change a png in the theme folder. Look up a chameleon 2.0 tutorial ;)

I know for 'Extra' folder but don't know where I can find original tutorials for Chameleon 2?