Most people know how to do this nowadays, but just in case:
Warning!Iceborn wrote: Installation:
1) Unzip.
2) Place Koboz.hak in your NWN/Patch folder (if you don't have one, create it)
3) Place nwnpatch.ini in your NWN root folder; overwrite is generally safe unless you have other custom patches installed.
4) If you have an appearances.2da file in your override folder, read the readme for further instructions.
Done!
Uninstallation:
1) Delete NWNPatch.ini, or alternatively, remove the reference to koboz.hak from NWNPatch.ini
2) Delete koboz.hak from your patch folder.
This override override's all 4 player kobold options. This means a lot of Kobold's will come out with a plain fleshy pigment that may be jarring. Any player not using this is likely to look similarly jarring. I'm also unsure how it will interact with the color mirror's in the Character Customization Area, but since the colors you choose in the character creation screen will transfer over to the Kobold, it theoretically should work.
I would be much obliged if the first to try this is successful in changing their skin color using the mirror.
Also, I did not test every possible armor combination. Let me know of any encountered bugs and I'll see what I can do.
Download Link - Updated 7/30/2015!
Kobold1 Description: This one will give your male and female kobolds a scaled appearance, but as a consequence, all humanoids will appear to be heavily scarred.
Koboz2 Description: This one will your male and female kobolds a kobold appearance with human skin. I recommend this one because it will allow you to see armor on your kobolds, while preventing every Human and Drow you encounter from looking like Sion.
Noted bugs:
Misaligned pelvis and thighs. -Mayonaise
Crashes when -polymorphing have been reported -Iceborn (Nothing I can do about this one)
Robe 1 and 2 did not appear to be models that were converted to the Kobold, so these likely won't show up.
Update
Updated the appearance.2da's to 1.69 standards. I recommend re-downloading if you are using these.