A few people have asked, so here are two ways to go about it, nothing complicated, I promise. 

Method 1:

This method consists of switching out the eye texture with something more to your taste. There are a few mods on the nexus that have unique eye textures that can be used as replacers, the ones I know of are Eyes of Glass DA2 DAO by Khylian and LOTC s Eye Textures for DA2 by marquiseondore.

-

You'll need:

 -Bioware .erf Packager
- pyGFF Editor

Extract them both in separate folders.

-

-First off, you're going to want to grab the .erf file associated with the character you want to edit, I'll go with Fenris'.(Fenris_Files.erf)

- Open pyGFF (editor.exe), go to File --> Export All and export the contents of the .erf to a new folder , name it however you like, I'll go with Fenris_Files. Click yes when prompted to overwrite.

- Once the contents are extracted go to art\characters\playercharacter\shared\heads\textures, inside that folder you'll find some .dds files, the one I want to replace is mt_eye_fenris_0d.dds

- Now that we've got that set up, take the .erf of whichever mod you'll be taking the replacer texture from, I'll go with eyes of glass, and extract it's contents to a new folder.

- Where the eye textures are situated is at the modder's discretion, so you might have to search around a bit, Kylian kept to the vanilla pathing, so you'll find their eye texture in art\characters\playercharacter\shared\heads\textures

*I highly suggest you use the Windows Texture Viewer to quickly make out what file is what*

- Once you've chosen your replacer (I'm going with mt_esm_iceberg_0d.dds), rename it to mt_eye_fenris_0d and copy it over the original eye texture in Fenris_Files.

-That's it! Now all you have to do is drag your Fenris_File (or whatever you named it) folder over the Gibbed.Bioware.ErfPack executable and it'll automatically pack it into an .erf.

- Once that's done, put that .erf in your overwrite folder and voilà, blue-eyed Fenris.