abstract backdrop background decoration decorative desktop diagonal pastel structure structures texture textures wallpaper canvas color colors colour colours paint painting series variation variations shapes swirl art blue design encaustic green kaleidoscope pattern psychedelic art starfish symmetry abstracts backgrounds beige brown brush concept creation depressing distressed drab fill flaking flaky graphic grunge grungy image messy neutral New ochre old original peeling render style tiled tiles tired unique vector abstract background electric blue grass magenta plant purple space Terrestrial plant twig violet wood