halftone grunge noise texture. dirt speckles, spots, dots background. black white grit sand grain wallpaper. retro

halftone dot grain comic texture noise vector retro pattern vintage overlay bitmap background grit cartoon distress black grainy dirty rough manga duotone dirt poster old semitone pixel grid scratch dust worn speckle concrete grunge spray book grungy gravel backdrop canvas splatter rust spatter print bg speck sand gritty snow