Thanks -- that is indeed probably the best way to go about it. I just don't really have access to printing directly, so I'd have to order something to be printed online and then sent to me anyway, so I'd sort of thought getting something that had already been designed to display behind 1/6 figures would be easier. But I will definitely bear that in mind for future, especially when it comes to more specific types of backgrounds that wouldn't really be readily available any other way : )
OneSixthFigures