abstract backdrop background canvas colour colours fabric grunge grungy paint pastels rough series spatter texture textures variations weave woven ba1969 CGI cosmic fiber light optic stars color colorful colors dot dots halftone hues pattern shades spectrum tone tones variation bar bars header headers pastel set distorted eight graphic grid illusions optical sphere curves orange swirls symmetry bark collage fungi leaf leaves moss nature balls green red yellow elegancy elegant illustration style wallpaper