Retexturing

NIF Retexturing

NIF files, although not presently editable, can be re-textured. This means you can take base objects and apply different textures to them creating a new in-game object with the same shape but with a different look.

You will need a very handy utility for this, its called "Texture Replacer".

A discussion about it on the main forms is here: Forums Thread
The download link is here: Link to download