No, not the curtains! These vast tracts of land, available now in Background-Landscapes (a completely new set). The idea behind these is that you can use the "multiples" setting to piece together your own scenes. So for instance, there are some standalone trees, some middle ground plains, plenty of far-off mountains, some piles of rocks, etc. This is another experiment along the lines of the Rooms and Furniture sets, so let me know how they're working.
If you have other landscape elements you want to see included, let me know.