Grass005 and Fabric061: ambientCG, CC0 1.0 Universal.
https://docs.ambientcg.com/license/
Brushed Concrete: Poly Haven (Dario Barresi / Dimitrios Savva), CC0 1.0 Universal.
https://polyhaven.com/license
License: https://creativecommons.org/publicdomain/zero/1.0/
Resized for this game. Fabric diffuse converted to neutral detail; roughness packed into normal-map alpha.