bitmap pixelated grunge gradient texture. black and white dither pattern wallpaper. abstract glitchy 8 bit video game

game background halftone dither bit gradient 8 pattern bitmap arcade vector art retro texture dot effect geometric square shape graphic gradation mosaic abstract fade horizontal white computer play wallpaper speckle grid spread black vintage old dithering screentone halfton bw overlay comic semitone duotone bg video pixel noise grunge cartoon