motif

motif
/məuˈti:f; mo`tif/ n
1 decorative design or pattern 装饰的图案或式样
    an eagle motif on the curtains 帷幕上的鹰的图案.
2 theme or idea that is repeated and developed in a work of music or literature （音乐的）乐旨, 动机; （文学的）主题.

牛津英汉双解词典