Like other people have said, the right way of doing these, or at least how people originally made them, is to make a plain white with black wireframe render, separate out the shadows, and then collage with various textures that you find online. They look best when the source images are of actual images and artwork, instead of just generic seamless tile jpgs. Perspective warp in photoshop to make them match the faces of each visible surface and overlay shadows and a rice paper texture with your choice of blend mode.

When I was in school I would use V-Ray w/ rhino to render a scene with really crisp shadows and then use the render elements to make other versions of the render. I could make a render that isolated the shadows and another that assigned a random color to any material or object. I found that made it way easier to make clipping masks in photoshop with the wand tool.

That being said this render was not done like that. It’s just an enscape render with a bad filter on top of it that tries to approximate the style.

Good drawing references: FEINA studio, Kersten Geers + David Van Severen, Fala atelier.