THIS HAS NO RELATION TO MY OTHER TUTORIALS, BUT IT MAY BE BETTER TO READ THEM FIRST SO YOU KNOW WHAT I AM TALKING ABOUT AND YOU CAN MAKE MORE EFFECTS.
This tutorial is for Photoshop only. I may make these same lessons in GIMP if I install it later on.
Flow is very important for a sig to have. If your sig has no flow and things are everywhere randomly, it won't look good. This time, I won't be giving you so much of a tutorial as a job to do. I will tell you what to create and you will do the best you can to make it. You will then post your result here and somebody will tell you what you need to do to improve on the lesson.
Flow is the direction in which your sig has motion. For instance, my Yoshi sig that I used for my technique lessons has a down-right flow. This means that all the effects are sort of pointing towards the down-right. The direction that your sig flows in really depends on your render. Most of the time, if a character is running, the direction that they are running is where the flow comes from. This also applies if there is wind.

If you were to use this render, the flow would be to the up-right becuase thats where it looks like the wind is coming from.
Flow is really something that comes with experience, so don't get frustrated if you don't get it.
So please post your results of a sig with flow.