From Kingdom Death: Monster
Genuine goblin-made, and possibly hobgoblin-made primitive barricades, great for cover as well as atmosphere.
Sacrifice your offerings on these bits of plaster-smeared foam
Dais? Platform? Whatever the correct terminology, just a generic piece to experiment with.
The first extra set of interchangeable pieces
From our DM: doors that fit between dungeon tiles (and swing open!)
The journey at long last comes to an end
Finishing the structure: an awful lot of wood chips and plaster
The journey continues: adding a stone tile base, and a wonky foam skeleton for the rocky tunnel
The beginning: a stone arch with modular, theme-able pieces
Maybe even too small. At least it's all downhill from here.
From our DM, how to make giant foam cliff-like rocks
A plain old box
Crafting a small table out of foam
Our DM shows his process for making some modular walls/ruins
Our modular tile set (Spoilers: Lost Mines of Phandelver)
Making a rectangular dungeon tile for use in a cavern
How to make a modular tile for use in a cavern
Standard stone dungeon pillars
Making a river for our cavern dungeon
Making a waterfall for the river tiles in our cave
Testing water effects for a small river system