the halftone faded gradient texture resembles grunge halftone grit. the wallpaper shows white and black sand noise. the

background dot comic gradient noise cartoon bitmap effect retro grain pixel vintage subtile grid old grit snow poster grainy overlay dirt design digital concrete halftone wave monochrome gravel wallpaper grimy spot texture dust speckle dotted distressed grunge gritty aged messy dirty faded rough rust cover wavy graphic ai generated