During the editing of the rainbow apple logo I got the idea about using it as boot logo on my MacBook and did some research and found app exists to allow you to change it and it comes with a prepared rainbow one too.
Here it is in action on my MacBook:
I did that using the BootXChanger app from http://namedfork.net/bootxchanger/ to change it.... Grab the app and try it for your self.
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