halftone gritty noise texture. grunge grit halftone background. black dotted sand noise wallpaper. retro comic pixelated

comic dot bitmap texture background noise halftone grain pixel vintage grit speckle cartoon overlay grunge retro duotone manga effect digital poster old semitone grid spot sand dust snow pattern grainy rough vector gravel rust bg dirt paper book backdrop grungy distressed particles cover screen bw white gritty halfton dotted