This guide is about teach you to change startup or boot screen on Mac in easy steps by using bootxchanger, which can change the boot image and background colour on Mac
All friends used the Mac all will know, it will always appear the classic gray Apple picture every time on Mac startup screen. That you have not thought about how to chang this Apple to the other pictures? Like the following.

feel cool? I tell you how to modify the startup image.
No.1 step
First of all, you need to download a gadget called bootxchanger. After download and run it, it will appear the following interface.

No.2 step
You want the picture displayed at startup, then drag it to the blue box, click “Apply” on it. Is not very simple?

In addition, you may not be able to find the right image. It does not matter, in bootxchanger installation files “Sample Boot Images” folder you can find a picture you like.
If you are interesting in this app, go to try it now!
About bootxchanger
It will allow you to change the boot image and background colour on Mac OS X 10.4, 10.5 and 10.6
Tips: If your image has transparency, it will be redrawn over the background colour before being applied, so save the original somewhere in case you want to change the background colour later. Some macs will scale big images down when booting, or ignore the image if it’s really big. Some newer macs may not accept any image, and only change the background colour.
DigitByte Software for Windows, Mac, iPhone, iPad, iPod – free download