Rainbow Backgorund in Photoshop

Really nice and attractive final result where you will create a rainbow background from a scratch.

Create a new custom size document.

Click above on File an select New...

I have chosen 1024 x 768 pixels.

Press D key to set black and white colors.

Click above on Filter, Render and choose Fibres...

Set the same settings like I did and press OK button.

Here is the result.

After that click above on Filter, Blur and choose Motion Blur...

Set the same settings like I did and press OK button.

After that click on Create new fill or adjustment layer and choose Gradient fill.

In a Gradient Fill window select the Spectrum Gradient and don't close the window.

After that set Angle to zero and confirm it.

Set layer's opacity to Overlay.

We are finished.

And the pic in it's full size.