There are some props I could use for shellendrak.
My 2 main ones:
Potted plants, in several sizes and varities.
The other pianos and other musical instruments.

Others:
Tables with games on them like cards or pool, I can get chess from C&K. Also maybe one with booze on it
Random cabnets and cupboards.
Coatrack/closet

Oh ggodness, I remembered a horror trope/cliche that needs to be done! Faces and/or hands visible in the wall and/or ceiling, stretching it....

The Auld Grump

I've been playing with some kitbashing and there are some shellendrak bits I really need.

1 Wider sections of the shingle roof. So I can do some roof peaks. Ideally a full sheet of them like the flat roof top comes.
2 Some porch posts and railings. Thin ones like on a normal house, not wide 3d columns, they'll probably have to be a flat piece.

Also I've noticed the the columns that are included in shellendrak don't have textured tops. Which isn't a problem if your using them to support an overhanging 2nd story. But if you're trying to use them as decoritive pieces, like in the promo shots, they don't look right.

Another useful prop for shellendrak: guns, either mounted on the wall like the swords and shields, or in some kind of gun cabinet.

Mounted ones could be big hunting riffles that go in the room with the animal heads. Or maybe displayed as some type of collection.

The gun cabinet is harder. I suppose it would either have to have glass doors, or be more like a rack. With the riffles standing like pool cues. It could be more of a wire cage type thing but that would probably fit in more with mayhem sets.

Just a thought....

But you could probably do a gun cabinet based off the kitbash that Aleph13 did a while ago.

Replace the back texture with a number of guns, and add doors made of ltransparancies with a few lines on them and a thin border of wood.

I would guess you could probably find some of the textures for modern guns from Mayhem Armory. (I don't own MA so I can't say for sure) Older guns you may have to grab yourself.

Heck you could probably do a China Cabinet using the same method.

I don't know about the liquor cabinet. A gun case for riffles would be vertical right? If you wanted to use that cabinet I suppose you could make the back texture wood and put handguns on the selves.

As far as armory goes, I don't have it either so I don't know whats there.