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2d aurora glow help

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Hi guys, I am trying to imitate an aurora glow for 2d games.


I don't know if this is the right name, but it is used everywhere in Blizzard's Hearthstone card game

even on its homepage http://us.battle.net/hearthstone/en/, you can find 3 kind of aurora effect on its main banner

the banner is a movie file http://media.blizzard.com/hearthstone/videos/home-header-bg-video.webm, so its impossible to diagnose it


Here are some static screenshot


[attachment=19825:hearthstone-crafting-disenchant-alert-4-first-disenchant-earns-95-dust (1).jpg]



I've tried to do this with particle system, however, not satisfied with the result, and it is expensive too



any direction on how to generate this effect in real time?

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