If you haven't checked out desktopper.net you are missing out. Although the site is almost completely in Japanese, you should be able to make sense of some of the OS X GUI hacks from the pictures and scant English text.
For instance: This link points to a GUI hack to replace the "Initializing network" text at startup with whatever you want.
Navigate to '/System/Library/StartupItems/Network/Resources/English.lproj' with the Terminal (substitute the other languages for 'English' if necessary). Now type 'pico Localizable.strings'. Replace 'Initializing network' between the String tags with whatever text you want.
You will need a restart to see this one, a logout doesn't show this window.
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Mac OS X Hints
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