Stuff like stanchions, fences, half-walls that would help divide up a large space without putting in full walls. These would ideally occupy the edge of a tile, not the middle, and would still allow for placement of an object inside the tile (like the hedge where a flower pot can occupy the same tile the hedge is on).
A lot of the example pics are for outdoor partitions/fences, but they would work in an interior setting as well.