
(proof of concept)
Tools used:
Erf Packer:
http://mod.gib.me/dr...fpack-rev21.zip
-- by gibbed
gff4editor:
http://social.biowar...ect/1936/#files
You will have to download the fnvhashes 7zip file as well on that page, only with it you can decode the filenames! Simply place it into the folder of the editor to make use of it.
-- by Mephales

(don't put his tutorial on other websites/forums, instead link to this Nexus thread)
Same example (as text only version):
Open an erf file (drag it on the editor exe) from the game and extract content to a folder of your choice.
Rename the files (example for Merrill and Athenril):
ef_athenril.mor <---> ef_merril.mor
You just swapped the head morphs of two characters from the game. You don't need to swap though, but I don't want two characters to run around with the same face ; )
Repack it:
Use Gibbeds Erf Packer for this:
Create a folder with a random name, here simply "test" without brackets.
Put the changed mor files into it and drag it onto the Erf Packer exe.
Place your freshly created erf file into the ovveride folder located in:
C:\Users\USERNAME\Documents\BioWare\Dragon Age 2\packages\core\override

(high-res screenshot)
Enjoy!
Edited:

Proof that elvish face morphs work on human bodies and NPCs.
Elvish champion here we come.
(or other races...)
Edited by AmmonLymphater, 14 March 2011 - 11:09 PM.