These are openLOCK connectable free form dungeon tiles. These have texture and have a variety of inter-connectable designs.
The openLOCK clips can be downloaded for free from this link.
https://www.thingiverse.com/thing:2343306
I have painted these to be dungeon pieces, but nothing says that they can't be used with their texture as dense shrub as well. The unique characteristic of these tiles is the pivot that allows rotation of over 320 degrees on the fly. So you can connect up your walls with pivots at key locations and rotate the design to be the bend desired. The pieces are held together, however, so you can keep them connected and then place them with one move and then rotate about the pivots to make a variety of rooms and passages. No need to draw and erase borders. Just place, rotate and there is your new dungeon layout. Can't quite get your dungeon design, well use the clips to move a few pieces and they are still held together, but slightly different in layout.
The author hasn't provided the model origin yet.