I used Phototextures. I wanted to create a creepy lost place vibe, so I decided for desaturated colors and decrepit textures.
I recorded some shots and edited them together with Premiere Pro
on the left are moodboard and color palette, on the right the top down floor planning
Blockout
I planned the needed modules by designing them in orthographic perspective
modules with wireframe
texture atlas (4K x 4K) and decal atlas (2K x 2K)