A downloadable asset pack

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Includes dirty stone walls, concrete, marble, tiles, doors, decals, bricks and terrain/grass.

Most of my own are 1024x1024 and others are 2048x1024. The ones with "Wall" in the name are tiled/seamless horizontally while ones named "Tile" are seamless textures. It also includes some decals and door textures that have their own resolution.

Free for commercial use and all that, no attribution required. The only requirement is you put them to good use!

Create your own normal maps as needed:

https://www.smart-page.net/smartnormal/

Create your own Ambient Occlusion/Displacement/Specular maps:

https://cpetry.github.io/NormalMap-Online/

A good way to get the most out of a small amount of textures, is to use 2 different textures/layers on your Krita file, and change the blending mode on the topmost layer. You can use, for example, Soft Light (SVG) blending mode, this will add the properties of that layer onto the layer below, essentially mixing the 2 textures.