Hello,
This is my first submission. Naturally, I'm open to any suggestions.
I'll provide the source (.blend) file once the version has been finalized.
The .png files including the mobile version are listed below:

Breach

Files:
5k: https://i.postimg.cc/kGghS37t/Breach.png
plasma mobile: https://i.postimg.cc/G3kzzp4J/Breach-mobile.png

I'm just wondering - how would it look if the bottom right part was blue with a white layer on top, similarly to the top left one?

Looks very good. I love the composition and the idea of depth.

One thing I don't like: colors. They seem to be very cold. I would prefer warmer pallet with more vivid shades.

I also really like the composition here. Splitting a snowy landscape from a grassy one with a canyon feels really nice. I feel like the snow in the top-left could be a bit lighter and brighter though. Same with the grassy area (just a tiny bit). then you would have two bright corners separated by a dark canyon. That would be really slick IMO.

@niccolove
I tried it but it's a bit too monochromatic and I wanted something that would be a progression from the Ice Cold.
But if you don't fancy the colors maybe more saturated version will be more to your liking.
Edit: I made it anyway

Breach v4

5k: https://i.postimg.cc/SKT4HVgP/Breach-v4.png

@adomas
Perhaps something like this? It does look juicy but not sure if it's not too attention grabbing:
Breach v2

5k: https://i.postimg.cc/T3MyTRPP/Breach-v2.png


@ngraham
I think it does look better:
Breach v3

5k: https://i.postimg.cc/DfQsmJtX/Breach-v3.png


Thank you all for tips!
I'll keep working on it.

Very nice, I think you're getting there with that last one! The green area could probably be shrunk a bit so it doesn't have so much visual weight. Maybe it could be a fraction of the total area the way the snow part in the top-left is a fraction of the area that it's sitting on.

I might also make the snowy area a bit whiter.

Breach v5

5k: https://i.postimg.cc/BbfkCRF4/Breach-v5.png

I have a question. Is there a size limit for the wallpaper? I'm having trouble optimizing my second submission. It's around 10MB .png.

The edge of the grassy side could be a lighter shade of green, or some greenish blue, making it blue seems like the ice is attacking the grass with intent to conquer, and they have moved the front forward.

Also, the grass looks a bittoo plain, while the ice side is detailed. The same could maybeapplied to the grass as well: a bit of triangular noise, some parts a bit darker and some a bit lighter. That would make the grass more elaborate and less alien from the rest of the wallpaper.

I like it. It says Spring to me, signaling the coming season.

Calling it Breach might cause a bit of trouble though... Breach, security/data breach... Not a great message. It could come out as aggressive, which Plasma doesn’t want, especially not for an LTS release.

Thank you for suggestions!
I didn't even think that the name could be a problem. I could go with the name that I originally planned - Crystaline
It's more abstract but still related to the picture.

I think the problem is that light blue and green just don't go together in this scenario. So, I replaced it with "snow" and I think it looks much better.

Crystaline (Breach v6)

5k: https://i.postimg.cc/0QYY3FwZ/Crystaline-Breach-v6.png
mobile: https://i.postimg.cc/cHPQvZNs/Crystalin ... mobile.png

Oh man. I love it.

It's good! But at this point, the green seem in a strong minority in the image, it kind of feels "wrong" to me. It seems to be a very blue-ish wallpaper around snow and ice, and then there's grass on the bottom right, a bit in contrast with the snow. That's just my personal opinion though, feel free to dismiss it.

I could see that, yeah. I really like the current version, but I agree that the green area is so small as to feel a bit like an afterthought.

I see your point. I tried to increase the amount of "grass".

Crystaline v2

5k: https://i.postimg.cc/RVVFrvC6/Crystaline-02.png

Also, I have two more combinations that I quite like:

Crystaline v3

5k: https://i.postimg.cc/CMWg7YBp/Crystaline-03.png

Crystaline v4

5k: https://i.postimg.cc/4NNz8Crw/Crystaline-04.png

I have just seen that you created the ice-only version as I requested on the edit. Thanks However, the link says it's 5k but I think you accidentally linked the preview. Any chance you still have the 5k one?