It's not 'bout me being happy, it's just what the forum rules say.
Sorry if my previous posts sounded aggressive to you, that was not my intention at all. After all, I do like that signature (despite it having an anime render in it).
For mine I used several layers of abstract brushes with varying opacities, glow effects and blending effects, then I used the smudge tool to pull them around.
Mostly what Dopa said though, yeah. Though I tend to do it with one to two layers at max.
Also, an important thing is to get the perspective and twist for the engine trails right.