black dark concrete wall background. pattern board cement texture grunge dirty scratched for show anthracite promote product urban

grunge black texture background pattern abstract concrete design wall paper education paint wallpaper vintage construction retro blackboard floor scratched grungy material chalkboard distressed classroom aged chalk hard structure textured shabby dot grey rough weathered product solid old board dark dirty element blank blemish grimy surface empty backdrop decoration decorative detail background cement show anthracite promote urban decor