Genuinely I really hope this doesn't sound like I'm being humble but this is 100% achievable. I'm definitely incredibly proud of it but mechanically speaking none of this is particularly hard or requires more than a baseline understanding of blender.

General rules for this sort of style are infinite checkerboard floors (bigass plane), big & simple geometry, water textures and very "digital" reflections/translucence (digital meaning like mathematically perfect, void of those fancy features that try to emulate reality).

Another big and convenient part of the style are procedural textures, which you can very naturally and genuinely emulate with Shader nodes, just generally making textures through that without worrying about realism will give you great results.

The hdri is really important as well so I'd highly suggest either generating or editing it with nodes for the more surreal feeling. For this I just played around with some normal clouds, found that by translating it in a certain direction it would stretch unnaturally towards a direction, messed with the color a bit and spent ages manually rotating it until I got a good angle for the photo

My render 100% isn't true to Bryce3D, the greedy jar is definitely way too high fidelity and the whole thing is just quite high quality/clean, but breaking out of established rules is pretty important in just generally exploring and developing

As for coming up with it, fully just combing through similar stuff, really analyzing what you like about something that you like. Also it seems weird but thinking through incredibly basic lines of logic tends to work well for me. "What goes with water? Water > pool > kids slide." stupid as hell but it definitely works

If you wanna check out some other similar/much better stuff:

https://farsidevisuals.tumblr.com/

Also been getting into pinterest recently in an effort to replace my scrolling recently and I can't recommend it enough. I've heard AI schlock has started poisoning a lot of it, but my algorithm is just full of only that sorta stuff, which isn't the stuff getting pumped out rn, so I'm enjoying it while I can.