monochrome oil effect painting arbitrary smears tile pattern plaster surface charcoal digital painted black white backdrop

abstract arbitrary art artwork backdrop background black blots brush canvas charcoal coal color cracks design digital drawing drawn duotone dye effect fading form geometric gradient gray grey grunge halftone hand ink lines modern monochrome monotone mural oil overlay paint painted painting paper pattern plaster rock shades shapes slab slate smears smudges splinter spots stains stroke surface texture tile wall white