I created these textures originally for real 3D projects instead for games. Resolution goes up to 2k. I contributed these textures (as a higher res version,) to the blender cloud texture library, which are released under CC0 too.

These textures are just downscaled for a smaller file size.

many textures have normalmaps and heightmaps.

I created these textures from my own photo resources and from CC0 resources from http://duion.com/art/main.