How to install:
First you must have a graphics folder and within this a backrounds folder.
Xp Users this is where you directory should be:
C:\Documents and Settings\Your Name\My Documents\Sports Interactive\Football Manager 2008\graphics\backrounds
Vista users your directory should be:
C:\Users\YOUR NAME\Documents\Sports Interactive\Football Manager 2008\graphics\backrounds
If you do not have this directory then create it.
Now all you need to do is unrar or unzip the files to this directory and make sure that use skin cache is disabled.