Making the background:
bottom layer: fill with dark grey, add lense correction filter (filter > distort > lens correction).
mid layer: add some colour dots, add very much gassian blur. Layer mode: overlay
top layer: render clouds, opacity 25 %, layer mode: overlay
the background I found inspiration for here:
bottom layer: fill with dark grey, add lense correction filter (filter > distort > lens correction).
mid layer: add some colour dots, add very much gassian blur. Layer mode: overlay
top layer: render clouds, opacity 25 %, layer mode: overlay
the background I found inspiration for here:

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- : source