background birthday card curl curls curly flower flowers friendship love plant paper pink red sunburst swirl swirls texture valentine wedding botanical branch color colors colour colours foliage isolated leaf leaves long natural nature organic pattern plant series twig variation variations agriculture blue cloud crop europe farm farming field germany grassland landscape plain prairie rural sky summer yellow colorful hue hues shade shades simple single tone tones bark brown countryside damp fog forest grass green growth Haze lake mist plants pond trees water wet woodland woods