1) Make a new document, anysize doesn't matter. Press CNTRL+D to reset your pallete colors. Set your background to White..
2) Select the gradient tool and set these settings at the top:
3) Go nuts and make about 20 lines intertwining together:
Untill you get it looking like this:
4) Apply these hue settings (CNTRL+U):
5)
Duplicate the layer. Apply Filter>Sketch>Chrome with these settings:
Change the blending mode to Color Dodge:
Now you should have something looking like this:
6)
Duplicate the background layer. Change blending to Soft Light:
Flip the image:
Done dodda!
More Tutorials: 
