I have just finished a nice GDM greeter theme in black and yellow, based on a picture of my Gallery.



In order to install it on RedHat, get it here. Then click on your RedHat Menu / System Settings / Login Screen. Click on the "Graphical Greeting" tab and click on "Install New Theme" (make sure you select it after it shows up in the list). That is it.

Enjoy,
Julian

PS: If you wonder how to take a screenshot of the GDM (login) screen, this is the way it works for me:
echo "chvt 7 ; sleep 5 ; XAUTHORITY=/var/gdm/:0.Xauth DISPLAY=:0.0 import -window root /tmp/gdm-shot.png" > /tmp/capture
(This assumes your login screen is in VT7 CTRL+ALT+F7)

Now log off and at the GDM screen hit CTRL+ALT+F1. Log in as root and type sh /tmp/capture. The screen will switch to GDM and after a few seconds you will hear a BEEP. Log in and you will have the screenshot at /tmp/gdm-shot.png

Note: import is part of the ImageMagick package

Also, take a look at my GDM Theme HOWTO

All knowledge and software published in this website is released under the GNU General Public License (GPL)