A quick way to make backgrounds more interesting, you can alter the strength of the final image by adjusting opacity and colours according to your needs.
Step 1
Open up a new image and floofill it black using the paint bucket.
Step 2
Next, go to Filter > Noise > Add Noise. Make the Amount 400, and make sure Uniform and Monochromatic are selected, then press Ok.
Step 3
Now go to Filter > Texture > Patchwork, and change your settings to these:

Step 4
Go to Filter > Stylize > Glowing Edges and use these settings:

Step 5
Press D on your keyboard, then go to Filter > Render > Difference Clouds, and then press Ctrl on your keyboard and hold down whilst you press F to repeat. Do this as many times as you like until you get the effect you want.
Step 6
Colourise and you’re done:


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