Photoshop :: How Can I Create Background In PS?

I came accross this background effect in a magazine and would very much like to know how its been created. I wouldnt have any problems creating the underlying blue gradient layer but its the white spiral effect that Im not so sure about. Ive tried spiral or twirl filters but they havent really given me this effect.

Ive also tried creating a circle, filling it with white then drawing circles within it using the marque tool then deleting them. Still not the desire effect though, and maybe there is a much easier method?