Akin to the blank partitions we can wallpaper, I would love to have large thin floor tiles that could be "papered" with the different floor coverings. It would help offset the lack of rug options and allow for creation of things like defined dance floors that aren't excessively raised off the ground like the stages are. Ideally they'd be about as thick as a Zabuton Cushion and come in a variety of shapes (square, round, rectangle, roughly 50% larger than the largest existing rugs in those sizes).

More rugs in general would also be nice, especially long narrow carpet runners.