Step 1.
Create a new document of any size, the one I'm using is 500x500 and fill the background with black (#000000).
Step 2.
Create a new layer. Press "D" on your keyboard (to reset the colors to black/white), and go to Filer->Render->Clouds
Now go to Filter->Render->Difference Clouds
Press Ctrl + F on your keyboard 3 times.
Step 3.
Press Ctrl + U on your keyboard to bring up the huge/saturation panel and apply the following settings:
make sure Colorize is checked
Result:
Step 4.
Go to Filter->Noise->Add Noise, and apply these settings:
Result:
Step 5.
Go to Filter->Blur->Radial Blur and apply these settings:
Press Ctrl + F on the keyboard to repeat this one more time.
Result:
Step 6.
Go to Filter->Distort->Twirl and apply these settings:
Result:
Step 7.
Press Ctrl + J on your keyboard to duplicate this layer. Change the blending mode of the layer copy to "overlay"
Go to Edit->Transform->Rotate 180 degrees
Result:
Step 8.
Create a new layer. Go to Filter->Render->Clouds
Then go to Filter->Render->Difference Clouds
Press Ctrl + F on you keyboard three times to repeat this
Change this layers Mode to "Color Dodge"
Result:
Step 9.
Go to Filter->Stylize->Find Edges.
Press Ctrl + F on the keyboard two or three times.
Press Ctrl + I on your keyboard to "invert" the colors.
This should create a great looking abstract image which can be used as a banner background, or a sig. Experiment and change any of the settings in this tutorial to get different looking effects. Such as using distort->wave instead of distort->twirl. The key is to play around. Here's how mine ended up when completed:
