animal black cartoon dog drawing fun funny illustration ink pet background green leaf leaves nature plant texture tile tree wallpaper animals cattle cow cows eat eating grass graze grazing ba1969 canvas concrete rock stone surface wall watercolor colours paint sponge art arts brush color crafts duck symbol blood book dirty grunge messy old paper red stain stained burst design pattern star starburst balls button colors game marbles shapes sphere toys banner circular cloth copy space curved flag icon heart love purple rainbow spectrum