Spun Tunnel

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: