Welcome to tag of the day, my not-daily series where I share tags I found useful but underutilized in generations and explain how/why you should use it (and actually wrote up most of last month).
Wall and floor together provides a middle ground between “simple background, white background” and more complex backgrounds. These are useful for showcases since they offer greater prospective and visual appeal than just plain white backgrounds.
Possible pairings: Try making the wall and floor of various materials. Wood, stone, tile, and brick have all worked for me, and I'm sure there's other valid options.