There are three ghosts encountered in the Brecilian Ruins during Nature of the Beast- all of them speak Elvish, but the two who get actual conversations with the Warden (a mother and child) both use human character models.  This could be intentional on Bioware's part, but I thought it was a little strange considering that they spoke Elvish and the toolset describes the child as elven.  Accordingly, this mod makes the ghost boy and his mother elves while otherwise keeping their appearance the same as their vanilla counterparts.

INSTALLATION
To use this mod, extract the files from the "Ghost Elves.zip" folder and place the .mor, .utc, .cut, and .cub files in the override folder found at:
~\Documents\Bioware\Dragon Age\packages\core\override
This mod is not compatible with other mods that require the following files to be overridden:
kn_ntb330_gboy.mor
hf_ntb330_shade.mor (not overridden by this mod, but no longer used as the ghost mother's headmorph)
ntb330cr_shade.utc
73254_shade_first_line.cut
73254_shade_first_line.cub

UNINSTALLATION
Remove the files from the override folder.

Enjoy!