Wallpaper patterns, semi-circle, color, background, shading

art background ball black black and white blot blue bright cell circles color colorful dark drawing explosion form fractal geometry glare glitter glow graphics gray green grid hexagon light line lines mesh minimalism monochrome multi-colored neon obliquely optical illusion paint pattern pink plexus point radiation red rotation shadow shape shards shiny skull smoke spin spots stains stripes style surface triangle vector veil white