Use Find, look for weaponmod
This will lead you to several things you're looking for (under bioweapon.ini).
sfxweaponmod - where you can change the values of the various mods.
weaponmodgripcolours - kinda obvious
weaponmodemissivecolours - again with the obvious
Also, look for weaponbodycolours under each weapon heading.
...although I forget the order the colors are in with respect to the mods.
[Edited by StormSinger, 3/20/2012 11:31:14 PM]
[Edited by StormSinger, 3/21/2012 1:29:54 PM]