MDM configuration (linuxmint theme)

Another instalment of the MDM customization.
Specifically on the Linux Mint theme (/usr/share/mdm/themes/linuxmint/), which IMHO, is the best one.
As I already posted before, I hate, truly hate, when the wallpaper I'm using is not globally set, that is, when there is a different wallpaper on the login screen than the one I use on my own session.
So, this is what I'm doing:

cd /usr/share/mdm/themes/linuxmint/

And make a backup of the original file:

sudo mv  background.jpg background.jpg.ORIG

And then link to the image you want:

sudo ln -s /usr/share/backgrounds/linuxmint-qiana/mattbuck007_8263284303.jpg\
background.jpg

Cinnamon: Lazy MDM theme customization

The quick and dirty guide to get the same wallpaper across your login screen and your Cinnamon session.
I hate that the login screen has a different wallpaper than the one you are using (even on Scientific Linux), so, to get a constant wallpaper on Cinnamon, here is what I did:

cd /usr/share/mdm/themes/linuxmint/
sudo cp background.jpg background.jpg.ORIG
sudo cp $HOME/awesome-image.jpg \\
/usr/share/mdm/themes/linuxmint/background.jpg

Scientific Linux: Configuring default wallpapers

I hate when the wallpapers change and change and change while the box is booting, I like to have the same wallpaper all the way thru the booting until it reaches my own desktop and the box is ready to get to work on it.
So this is what I did on my Scientific Linux lappie to get thing the way I want them.

Setup login wallpaper:

sudo cp /wherever/Blue-Circles.jpg /usr/share/backgrounds/Blue-Circles.jpg
sudo emacs /usr/share/gnome-background-properties/half-circles.xml

The file has to end up like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE wallpapers SYSTEM "gnome-wp-list.dtd">
<wallpapers>
  <wallpaper deleted="false">
    <name>Half Blue Circles</name>
    <filename>/usr/share/backgrounds/Blue-Circles.jpg</filename>
    <options>zoom</options>
  </wallpaper>
</wallpapers>

Select from Preferences and setup Blue Circles as your wallpaper.
And then setup Blue Circles as the login wallpaper:

sudo cp /usr/share/applications/gnome-appearance-properties.desktop /usr/share/gdm/autostart/LoginWindow

Logout and back in, force select the "Blue Circles" picture as the wallpaper and login as usual.
Then, disable the further force selection (that will happen on every login):

sudo unlink /usr/share/gdm/autostart/LoginWindow/gnome-appearance-properties.desktop

Setup GNOME screensaver's login wallpaper:
This will change the login screen you get when you are using the screensaver and it asks your password to disable the screensaver.
It might be possible that it has to use a different *_default.png picture, this was done on a Thinkpad T60p that has a 1600x1200 resolution screen.

cd /usr/share/backgrounds/
sudo mv 2048x1536_default.png 2048x1536_default.png.ORIG
sudo ln -s Blue-Circles.jpg 2048x1536_default.png