halftone texture. faded dot pattern for prints. bg abstract gradient. black geometric background for overlay effect. subtle

abstract art backdrop background black circle comic curve design desktop digital dot dote doted dots dotty effect fade frame free geometric gradation gradient graphic gray grey grid grunge half halfton halftone illustration line lines modern mono monochromatic monochrome monocrome monotone net nois noise opacity optical overlay paper patern pattern perforation pixel point points poka polka polkadot pop popart print raster rectangle retro round screentone simple squiggle squiggles subtle swirl texture tone twist vector vintage wallpaper wave wavy white