to be honest it's not that great but some people may like it
1. Create a new document with the width 500 and height 150. of course this could be any size. Press control+i to invert the white to black.
2. go Filter-Render-Lense Flare
3. Using the 50-300mm Zoom option, place flairs in various places using different brightnesses. (you will need to do a filter-render-lense flare each time). Until you get something looking roughly like this
4. Filter-Stylize-Find edges and desaturate using ctrl+u and putting saturation down to its lowest possible. You should end up with something like this:
5. adjust the levels using ctrl+l using these options:
6. invert the image using ctrl+i. Go to Image-Adjustments-brightness/contrast and i used +40 brightness and +30 contrast.. i think..
7. from here you can colorize it or customise it how you want.. remember tinkering around with brightness etc will change the image completely...
Heres my final result