I've already expressed an interest in getting a mold with curved ruins, so it goes without saying that is my first suggestion. whilst talkng about curved fieldstone, I would like suitable door arch / window openings to suit round towers, and a really tight curve (3" or possibly eve 2" diamater, to create rounded balconies), perhaps that is a little too specific to be of general use?

with regards to accessories, I'd quite like to see some varied decorative pieces - gargoyles and similar wall adornmets, which could be used to decorate walls, fountains tops of pillars, doors etc.

Floor-wise, I would like a 1" - 1."hexagon set of tiles - (Again, possbly not one that will attract many builders? - But just something I would like.)