Basically, by making icons. Coloring techniques and types of textures work differently depending on the coloring of the original cap. Usually, but not always, if a particular method works on one image from a given scene, it will work on the entire scene. So, I'm going through various episodes and movies, picking things and trying them out to see if they work. Most of my iconing is by trial and error. Once I find something that works, I create a script in my graphics program that will allow me to duplicate the technique in a few mouse click on other graphics.