I have two end pieces/borders in the ES-series, to complement the stonework and statues in the S-series. First is ES-2, which has a lone statue of a warrior with a poleaxe in the middle of a room. There's another room in the same geomorph accessible only from the left side; it's on a level above the statue and has a passageway running underneath it.
The second geomorph is ES-3, another statue, but scaled a little smaller and just barely visible around the corner of a crooked tunnel. Add a few torches behind it to cast a long, threatening shadow and you may temporarily fool the players into thinking there's a swordsman waiting in ambush. There are also two secret doors, one leading into a small room beyond the statue.