It could involve just the texture of the item moving (like the skins in apex legends) or parts of items could be animated, for example the erth shoulder item could have leaves falling from the tree(leaves could leave a kind of trail like flames), fish pond item could have the fish moving around or some water droplets falling into it.

Maybe on unity engine but I don't think tb will be able too

I fully support this. I'd love to see a helicopter flying around or maybe an amusement park in the background.
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Some cars or people walking by would be neat.