A quite simple mod which turns vanilla party into Darkspawn.

There is a version with unchanged soundsets and with climatic darkspawn voices.

You may change your character into darkspawn as well (by console, Toolset).

You can add darkspawn talents and even change core class specializations; they use default weapons and most vanilla talents work properly; special talents for Shriek and Ogre are not supported by tactics
more info here: http://dragonage.wikia.com/wiki/Console_(Origins)

I'm working on switching factions for darkspawns (make them friendly) and plenty of humans (make them enemies). As optional subfolders.

READ THIS FIRST AND CAREFULLY

I highly recommend to create a new character; this won't work for already acquired party members.
This mod will permanently change your saved game; save only if you wish continue playing as darkspawns for this character!
Don't forget to remove mod before start playing another characters!
Remember to make backup copy of your saves, just in case.

Installation:
-put folder here: documents/BioWare/Dragon Age/packages/core/override
-you can delete any unwanted file or/and subfolder

Credtis:

Special thanks to authors of these tools:
pyGFF editor
K-GFF editor
DA Toolset