Just a little tip, you can actually take a screenshot of the login screen using a delayed terminal command. From
this thread over at MacOSXHints, you can see that typing:
Code:
sudo screen -m -d bash -c "sleep 120; screencapture /Users/username/Desktop/loginscreen.tiff"
...into the terminal and then typing in your password (as it requires
sudo to run), will take a screenshot afer the allocated time (in the example, 120 seconds) and drop it on your desktop when you replace
username with your account's short name. To get it to take a screenshot of the login screen, type the command in Terminal (Applications/Utilities), replacing username with your account's short name, and the number after
sleep with the amount of seconds you think it will take after you enter in the command to get to the login screen, then hit return, type your password, and hit return again. Then, depending on the amount of time you gave it, log out, wait until you're sure the amount of time has passed, and then log back in. If all went well, you should have a screenshot of your login screen on your desktop! If you looked at the thread I referred to, the hint itself actually describes a method using SSH, but later on down in the comments someone described this method, which I find to be much easier.
As far as changing the actual background goes, I used the method that was previously described as that was the easiest, but I know that there is another way, as the Macs at our video lab have a custom background, and I checked in Library/Desktop Pictures, and the Aqua Blue.jpg there was the default one... Oh well, I couldn't find out how to do it without replacing Aqua Blue.jpg, I guess it's not really going to hurt anything.... Also, I know additional customizations can be added by modifying the loginwindow.nib file, or using a third-party program (such as Visage, which was linked to in a previous comment), but I like it just the way it is!
Oh yeah, my login screen's attached...