I know how to load the projectile's in the render window and all that, but lets say i wanted a custom spell to use a copy of the Reanimate Projectile, but in a different color. How would i change the color from bluish to greenish?

I was kinda interested in this too, but turning an Ice spike into a stone spike (so changing the texture or at the very least, turning it grey instead of white)
I was attempting to use Nifskope, a bsa unpacker, and a graphics editing program. Any advice?