Do you mean like you in this picture: https://www.nikdaum.com/news/mai97.jpg
If so, create a solid and add Noise & Grain -> Fractal Noise and mess around with the settings until you get a pattern you like. Place it over your image and mess around with the transfer modes. You could also add some color to fractal noise once you get the pattern to your liking. Also, if you aren’t familiar, you can use the evolution settings to make the light move over time.
The Generate -> Cell Pattern effect also might be a good starting point.
Johnny Cuevas, Editor
Thinkck.com
“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.