Open a new document with the size you want ( I used 1600x900 because it's my desktop size)
Then go to Filter > Render > Clouds with black as foreground and white as background color selected, you will have the following Result:
Now go to Filter > Pixelate > Mosaic and set the cell size to 15, it should look like this now:
Then go to Filter > Stylize > Find Edges, now it should look like this:
Now go to Filter > Blur > Radial Blur with Amount 35, Method Zoom and Quality Best, you will have the following Result:
Now go to Filter > Stylize > Find Edges and it will look like this:
Then press Ctrl+I or Image > Adjustments > Invert, now it will look like this.
Now we want to add colour so we press Ctrl+U or Image > Adjustments > Hue/Saturation check Colorize and then play with the Rulers until the Image looks nice. My final Image:
And all this can be done easly in less than 5 Minutes.
I hope you like it, Feel free to comment