u have to do it manually.
its the blet file in the teams .fsh file
a good example is the atlanta's .fsh file,
open it and u'll clearly see the letters,
extract it,
edit it, by 1st removing the gray background leaving only the letters,
(use photoshop) change the colour of the letters normally, now change the background to something wickidly unmatching to the colour of the letters ( bright green or something crazy) save it,
open the saved picture with ea graph, save it as a fsh, now open the saved fsh, make the 'bright green' transparent.
now open the teams.fsh which u should extract, import the new blet file into fsh.
done done and done
hope it works for you guys