art background black blue curves design flourish flower graphics nature orange plant red snow spiral swirl wallpaper wave white winter leaf tree abstract backdrop balance collage concept fill frames graphic green modern pink purple rainbow rectangles texture windows color colors decoration Easter egg eggs event groningen illustration rainbow-colors vector yellow brown colorful colour colourful colours decorative desktop ocher structure structures textures arcs boxes card corners light shadows shapes sun sundfractals sunset autumn backlit chilly early winter foliage frozen ice icey leaves macro maple maple leaves