halftone faded gradient texture. grunge halftone grit background. white and black sand noise wallpaper. retro pixilated

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