1) Make a new document, I used 300x300.

2) Select the Gradient Tool. Now set the Chrome gradient:



Set Difference blending change:



3) Go completely bezerk and make
tons of gradient lines untill you get something like this:



(Image above is 0% quality)



4) Now press CNTRL+U and this is where you get creative and make your own color. Try using saturation aswell.



5) Duplicate the layer. Go to Edit>Transform>Rotate 90 CW.

6) Change the blending from Normal to Screen. And you will have something like this: