Second time I've seen that image this week.
Either it will be as Toon says, or you could create it my layering over at opacity and varied coloured image. I keep a load of coloured blurs for just that sort of thing. On top of that is scanned marks and scratches, then the main elements.
Coloured blurs: Basically set your webcam on slow exposure and take pictures at coloured lights or through coloured objects. The cheapest way can be for use coloured sweet wrappers and fairy lights. - the blur is the really important part. Experiment with it but the difference is that the result will be more random as a result.
Effectively, if you want random and unpredictable, use this sort of method. If you know what colours and where, use Toon's method. Both will have similar effects.
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