I made a stamp for hexagon grid in a simple 3D-modelling application, and printed it out, works like a charm!
2 parts, glued together with hot glue.
Tools of the trade
Glued the two tiles on cardboard to create 1 big tile.
Added some acrylic texture thingie to seal te crack but leaving a small gap to make it blend in with the other grid lines
You guessed it, BMC black “mod podge” (..or my version of it since I don’t have access to the Mod Podge brand where I live. I improvise a bit when making this goo, works well enough for my projects at least.
Forgot to take picture before installing the flickering led. Had to dismantle the light, solder some short wires from the led to the battery “box”.
Added some greenstuff to replicate a lousy torch. Hot glued the 3D-printed column to the battery box with on/off switch
Thanks to RobagoN for the .stl from thingiverse:
https://www.thingiverse.com/thing:2990524
I modified this file to make a somewhat hollow column to allow for a wire to go through it and scaled the whole column up a bit. I hope RobagoN can make a proper version of this, better suited to contain the battery box.
Forgot to take picture before this step, but I added some more hot glue to the base (really not happy with the base on this one, but I let it go due to time issues).
This step shows how I added the white acrylic texture thingie (looks and feels a lot like spackel I guess, but it is meant for artists when doing paintings with texture, I think).
Also added hot glue to imitate flames.
“chain” from a necklace, cut to length, dipped in Nuln Oil and added some rust color (brown + auric armor gold + water).
Drop of glue where the chain cross behind the torch, and just let it swing.
Also made a clamp from copper wire to imitate the thing that holds the torch to the wall. Drilled holes into the column and wedged it in there, no glue needed. I just let it be copper color. No time for extra work on this for now.
Both columns in position where they are supposed to be (for this scenario at least)
I’m fairly happy with the flames even when light is switched off.
The bricks on this column however? Not so much 
The black coating I use as primer for my projects is a mix of these two products + regular water.
Adding texture to my projects with this wonderful product (medium amount of grain) :
Also available in coarse (more grain) and smooth (no grain)