halftone noise texture. grunge grit halftone background. black and white sand gravel wallpaper. retro comic pixelated

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