it's all right, except, the effect textures come in .igb files, like the regular skins.
so you have to use texturefinder and muaskinner to find the offsets and all.
then, decompile the source file, edit it, recompile it with a new name, and voilą, you have a new texture
then, to use that texture, decompile the .xmlb effect file that you need to change in effects/chars/dazzler, and open it with notepad.
you will find, for example, this
texture = textures/nextgen/TEXTURENAME.png ;
(as i posted before); so change TEXTURENAME to the name of your new texture, recompile as .xmlb and it's done.
remember:
if you save your new effects in "textures", you'll have to write:
texture = textures/TEXTURENAME.png ;
if you save it in "textures/nextgen", you'll have to write
texture = textures/nextgen/TEXTURENAME.png ;