You can increase the flexibility of almost any 2.5D dungeon tile by adding modular dungeon floor tiles to your tile set.
The 3X2 floor tile can be used to create alcoves or recessed chambers along a passage way. They are big enough to locate an objective without having to wander through a huge room. Yet they are small enough to be overlooked by players who are in a rush.
Modular floor tiles let you build larger rooms without having to have huge tiles. In addition, you can create the room shapes you need for your encounter.