Grid of Light

Hi,


I need to recreate an image just like these, but the white grid needs to be on a different background. On a rainbow gradient background, possibly on top of a photographic holographic background.
So, I'm thinking I need to recreate the grid of light in white (using brushes?) looks to be several layers with some blurred out to create depth.


Or, is there a way to alter the dark blue background on these images?


Ideally I need to be able to edit the light grid too, because it might have different colours running through it.


Any help is SO appreciated on this, it's for a really important job!
Thanks so much 🙂