I second wwbushidow's suggestions. Good little accessories to finish out a build. I would add a chipped stone circle that could be used as a table top or a small (low) statue base. Now, as a long shot, if there is room on the mold, small things would be nice. Like:

Plates, platters, bowls, cups. Very little space taken up. Would fill out MANY differant builds - from an Inn, to a cottage, a kitchen/banquet area of a large castle, even a military mess hall. I now these can be bought through other suppliers or done with doll house stuff, but it would be cheap and easy to mold them, I think. Heck, every time i fill a few molds and have just a LITTLE bit of plaster left over, I could make a tray or mug.

Anyway, just a thought.