How can I change color of a shock spell, I was looking in a textures.bsa but I can't find the shock spell texture ( there are fire and some other but no lightning ). Thanks

All dds connected to the shock .nif effect:

textures\dungeons\ayleidruins\ARParticle01.dds
textures\dungeons\misc\ShockParticle01.dds
textures\dungeons\ayleidruins\ARParticle01.dds
textures\dungeons\ayleidruins\ARParticle02.dds

I found these but I still can't connect my custom .dds to the shock.nif and can't add visual effect into a spell in c-set.

Try to DL this: http://www.tesnexus.com/downloads/file.php?id=10239
And look what he changed there.