All the flags have been re-done for FM 2011; previously available for FM 2010 as part of the Metallic Logos pack.
How to install:
Download, extract* and copy the folder to:
> my documents > Sports Interactive > Football Manager 2011 > graphics > pictures >
Create the folder 'graphic' if it doesn't exist, and also the folder 'pictures' under that.
Then open Football Manager 2011, go to Preferences > Display and Sound and untick use skin cache and tick always reload skin on confirm.
* To extract you need either 7-Zip for Windows or The Unarchiver for Mac. WinRAR is also just fine!
Thanks to kremmen (@ Susie / @ SI forums) for creating this!
Original thread @ Susie