any idea on how to make this?

[Walter Soyka]

It looks a lens flare halo, so maybe one of the lens flare effects (Optical Flares, Knoll Light Factory, S_Flare, etc.) can generate it.

For the colors, maybe Fractal noise + Colorama?

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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[Arten Koronidas]

thanks! I’ll try as soon as i can