I find Sprite style easier than stock style.
You get to create your own flow, etc etc.

If you asking for a TUT though i'll give a few tips i found useful when making my first one not so long ago...
Distort Filters like Shear and Ripple were useful... brush a few 50%Hardness circle and shear filter them and place them around in multiple layers. helps with flow better. Dont forget you mask off what you dont like after the filter.
Smudge ... well there's not much to be said for that. But use some soft brush smudges in the BG to get some colour variance and harder ones nearer your focus to create cleaner edges.
Colours try to use a trio of colours, when i went with too many colours i hated it, but with too little i hated it too. I used the Red - Yellow full spectrum, even etching into a tiny green tint and it looked good.
Liquify helps create easy flow, but be careful not to use too much, softly mask it off the further you get from the focus so it fades but try to create shapes at the same time, works wonders.