/3/ - 3DCG

so i have a question that maybe you can help me with, /3/.

see this video?

https://www.youtube.com/watch?v=LK9Wm3FMBP4&t=424s

it's basically a tutorial on taking generic flat techno textures, in this case, quake 2 green metal army base stuff, and then bending and breaking them along the lines however you want, to make shapes - basically texturing BEFORE modelling environmental shapes.

i think that's a great idea for a workflow that can come up with highly modular, reusable assets with super efficient poly/vert counts that still look cool.

problem is, i can't find any tutorial that would teach how to make these sorts of hand-made textures. really not getting anything relevant in youtube when i use predictable search terms.

is there anyone who has experience and knowledge of the first 2/3rds of 3D modelling? i've done some stuff like pic related, but i'm looking for photoshop education that would help me create a predictable and uniform procedure for making these kinds of textures.