Hmmm… let’s see…
Cobblestone fences–simple walls, often seen in rural areas for marking land or corralling animals. Also, a gate, which would have stone posts but wood for the gate itself. This might be a step up from wooden fences for protection, but since the stone isn’t heavily processed, it’s not too much stronger.
Stone “paneling”–allows for a stone backing on parts of walls where you wouldn’t necessarily want wood: a kitchen, a forge, etc. Places on the wall like tapestries, but maybe comes in different sizes for a variety of dimensions. (This would allow the whole structure to be built out of wooden walls, without a strange blot of stone wall in the middle of it when looking at the outside of the structure.)
Stone beacon–a small, simple light, used in the wilderness to mark roads, caves, or other points of interest. Possibly a small torch or candle, rather than the current lanterns we have, giving it a basic, primitive look.
Stone archways–the first awning to a structure without a door set in it. Good for basic storage facilities or setting up different rooms and corridors underground. Could also be a wood variant to give a more “mining” feel, but that’s not part of the mason. Possible height and width variations for different situations.
Stone doorways–same as before, but with the wooden doors we have set in them. Just a little more diversity, plus a possible defense bonus.
Stone-mounted flag/banner–We currently have a banner, but it seems…temporary. What about a flag that gets a more permanent base and looks more presentable to visitors? Might be an upgrade to the camp standard, considering the big difference is the stone foundation.