After having the Zero for a week, I have one gripe that I really hadn’t considered when I first got it. Black interiors are just not a good idea. It just makes it very hard to see things in there, especially bits of filament and such.
Fortunately, It should be fairly easy to partially fix. When I get the time, I’m going to completely remove the side panels and spray paint the inside surface in something neutral.
Not sure about doing the back. I don’t really want to disassemble it that far, nor do I trust myself to mask it adequately. I might look for something like a vinyl adhesive.
I thought about it…
I like the look of the blacked out Sovol Zero but my old eyes need a lot of light, so my plan is a lot of LED light, per Martin’s post. I haven’t done that yet.
I was originally going to lighten the interior with light gray 3D printed PLA-LW insulating tiles on the inside of the printer to assist the passive heating but I realized that the passive chamber heating on the Zero is already excellent.
Here are some tips from someone who painted the inside of his Zero.
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Your eyes must be bad… 
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No disassembly
No masking
No paint fumes
100% reversable if you don’t like
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That video is definitely something that is influencing my desire to paint the interior. I have no intention of painting the outside, I like the black. But I’m thinking of painting the inside a light gray. I don’t want a harsh white.
The left side panel appears to be the easy one. There’s nothing attached to it. The right side is a bit more work, since the exhaust fan/filter assembly is attached to it. Still, looks easy enough. I can pull the back panel, and paint the upper part of it. But I think for the short-term, I’ll probably leave the rest of the inside back alone.
Just FYI, I got my Zero this week.
The spool holder is now side mount, with the fil sensor in front. Came with firmware 1.4.7.
Can you post a picture…
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And now, I’m thinking… (sorry)
What if, instead of painting, I used heat-shield foil tape.
I doubt it would do a lot as far as improving heat retention in the chamber, but it definitely would fix the issue of it being too dark. 
Added benefit of being easier to apply in places not easily unmounted.
Decent idea but I still think the magnet backed gloss white paper has a lot of advantages.
Contrariwise, I’m really not a fan of magnetic paper. I don’t need or want it to be that easily removable. And I don’t think I’d trust it not to come loose at the worst possible time.