I tried to have that effect by giving most of the christmas outfits large props to fill in the void a little.
I've thought of swapping in different backgrounds for the composites in the void based on the outfits involved as well, but that's as far as it could go. There are no ezcomposites in the void, and re-rendering all the other images would be too much work (the whole point of the void was that it was easier to render in). It might be jarring to alternate between composites with a christmas backdrop and regular images that don't have one, too.
This is be the kinda experiment an eager volunteer could take on btw ;) No coding or rendering skills required. Just start with a composite image of the void with all the christmas ladies, have AI fill in the background, then magic-eraser the ladies. Then just swap that image in for the void backdrop jpg in the game folder and see how that plays...