1. File > New. Whatever size you want, and the background color should be white. I used 400px X 400px
2. Select the Linear Gradient Tool, and set the blending mode to "Difference" (and press 'D' to reset colors!), also make sure the Gradient is selected to 'Foreground to Background'.
3. Now go crazy drawing lines everywhere for about 20-30 times! This is what mine looked like:
4. Now duplicate the layer and name the duplicated one "Wave", but then have the other layer (not the Wave layer) selected. Then go to Filter > Distort > Twirl and I used these settings:
5. On the Wave layer, go to Filter > Distort > Wave and I used these settings (after you get the settings in, hit Randomize a couple of times until you get something you like!)
6. Then set the Wave layer blending mode to "Lighten" then merge the two layers together! Mine so far looks like:
7. Duplicate that layer and then on the Duplicated layer, go to Edit > Transform > Flip Horizontal. Set the blending mode to Lighten and you got it!
8. Select one of the layers, press Ctrl + U (or, Image > Adjust > Hue/Saturation...) And the color I used:
9. Now select the other one, and press Ctrl + U again (or, Image > Adjust > Hue/Saturation...) And the color I used was:
10. Now merge the layers together and you got it!
The end result is random but mine looks like:
