An abstract background design, blue with some white wavy lines. Could be used as the background for a poster, or as computer desktop wallpaper or something like that. 背景設計 abstract、background、design、Imagenes en Cubilletes、poster 抽象、背景、設計、Cubilletes中的圖像、海報 資料來源:openclipart ( https://openclipart.org/ )