First I’ll start it off with a single basic Ellipse shape for the basis of the background pattern.

1. Activate the Ellipse Shape tool on the toolbar and draw in the shape.

2. This is the Basic Shape. Preferred size entirely up to you.

It’s also best at this stage to trim excess space from your document, or leave just enough to margin between your shapes, as I will do next. (Image/Trim or Draw a Rectangular Marquee then Image/Crop).
This is the Basis of a new Preset Pattern you will create next.

3. Next, go Edit > Define Pattern menu command.
4. Give this Pattern a name as I have captured, then hit ‘OK’.

Minimize this document for now, will be needing this later.

5. Now create a new document at your desired ‘Preset Size’.
6. Then go to the Toolbar and select the ‘Paint Bucket (G)’ Tool.
7. Then go to the top ‘Options Bar’, and:

(1) Change the ‘Foreground’ option to ‘Pattern’ (as I have captured) (2) Then select your previously made Circle pattern from the drop ‘Preset’ list.

8.Create a New Layer separate from your Background Layer.
With your ‘Paint Bucket’ Tool still selected, click once on the newly created Layer.

You should now have as I have captured to the right.

Here lies the basis of this tutorial, but below is just a little enhancement.

9. Then from the Layers Palette, at the very bottom, select the ‘Add Layer Mask’ feature (second from right) as I have captured.
10. Hit the X Key to set the Foreground/Background to Black/White.
Then select the ‘Gradient (G) Tool’ from the toolbar as I have captured.
11. Then up on the ‘Option Bar’ again:

(1.) Select from the ‘Gradient Preset’ drop down list and choose ‘Foreground to Transparent’ (Second from left) (2.) From the Gradient Type Options choose ‘Radial (Second one from left).

12. Then at random locations, click and drag (as you can see as I have captured) the position of the Radial Gradients.
13. I put in quite few of Radial Blurs.
14. Now maximize the previous document I mentioned earlier in Step 4.
Then go to ‘Edit/Define Brush’ option.

Give it a name as I have captured.

15. Now select the ‘Brush Tool (B)‘ Option from the Toolbar

Then up on the ‘Options Bar’ select the ‘Brush Preset’ Drop down options tab and select from the list the Circle Brush you just created. (Should be the last one in the list)

Then I’ll create a new layer (or multiple layers)for the brush images and place them at different locations. (And using different colors and various opacity levels)
Also throw in some text layers.

And here is the end result…