1. Start with a 400 x 135 image. 2. filter>render>clouds 3. Press ctrl+i to invert the image 4.Duplicate the background layer 5. On the duplicate layer use the gradient tool on these settings, untill you get bright lines( blend mode should be on lighten) 6.On the original background copy use the gradient tool also. 7. On the background copy press ctrl+u to color it. 8.On the orignal layer do the same as step 7. thats it! The outcome wont be the same as mine but the same idea. Here are some other ones i made.