monochrome abstract free form painting arbitrary smears rough pattern plaster surface distress digital painted

abstract arbitrary art artwork background black blots brush canvas charcoal coal color cracks decoration design digital distress drawing drawn duotone dye form free geometric gradient gray grey grunge halftone hand illustration ink lines modern monochrome monotone mural overlay paint painted painting paper pattern plaster rock rough shades shapes smears smudges splatter splinter spots stains stroke surface texture tones wall white