For my guildies.
Save the full size image in
C:\Program Files\Electronic Arts\BioWare\Star Wars – The Old Republic\swtor\retailclient\LoadingScreens
or (if you have a 64-bit OS) in:
C:\Program Files (x86)\Electronic Arts\BioWare\Star Wars – The Old Republic\swtor\retailclient\LoadingScreens
And enjoy!