Create a new image in Photoshop by using: File/New. My first image is 400 x 400 pixels. Next we will use Filter/Render/Clouds and then Filter/Render/Difference Clouds. You can keep using the Difference Clouds filter until you find one that you like. Next create 3 duplicate layers of your clouds (a total of 4 layers), you can either right click the layers or use Layer/Duplicate Layer. Now use Edit/Transform/Rotate to set each layer Darken. You should have a symmetrical image now and it should look like the one below, at this point use Layer/Flatten Image to create a single layer.

Now we are going to make the spheres. Using the Elliptical Marquee Tool set it to fixed size and the width and height set to 400 pixels. Center your circle and use Filter/Distort/Spherize. I used the spherize filter twice, but that is up to you. Next use Select/Inverse and delete the unused image. Finally use Image/Adjustments/Auto Contrast and you should have the image below.

I took this sphere and made a simple pattern, you can do whatever you want. Start by creating a new image using File/New, again making it 400 x 400 pixels. Now drag your sphere into the new image. The sphere is way to big so use Edit/Transform/ Scale to shrink it down to 100 x 100 pixels. I kept adding more spheres and made them smaller until I ended up with the pattern below, don't forget to Flatten your image once you are happy with it.

Create another new image using File/New and make this one 800 x 800. Drag four of your sphere clusters into the new image. Using Edit/Transform /Rotate you can create the four sided shape I made. Feel free to mess around with this and find some pattern or shape you like.

Use Image/Adjustments/ Hue/Saturation to colorize your image (click the colorize box). I chose a bluish color. Since I want this to be electric I decided to use Image/Adjustments/Invert to change the image color. Then to add the final glow I used Layer/Layer Style/Outer Glow. My finished image is below, click on it for the full sized image.