Even though it's intended for use with Football Manager 2014, it should also work with previous FM versions.
Released: 7 December 2013
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How to install
Step 1Once you have downloaded the background pack, open or extract it with 7-zip or Winrar
Step 2Now go to:
Win Vista/7: C:\Users\<username>\Documents\Sports Interactive\Football Manager 2014\graphics\backgrounds
Win 2000/XP: C:\Documents and Settings\<username>\My Documents\Sports Interactive\Football Manager 2014\graphics\backgrounds
Win 98/ME: C:\My Documents\Sports Interactive\Football Manager 2014\graphics\backgrounds
Mac OS X: /Users/<username>/Documents/Sports Interactive/Football Manager 2014/graphics/backgrounds
Create the folders "graphics" and "backgrounds" if they don't exist.
Place the "World cup 2014 roster" folder there.
Step 3Run Football Manager 2014 and go to: Preferences > Interface
Hit the "Clear Cache" button at the top, and then hit the "Reload Skin" button at the bottom.
Important: You need to have a skin with background support.