Jólakort - Yule Card
While not strictly a Yule Card, (this example does not bear the necessary Gleðileg jól on the front), this was a popular Yule card between 1910 and 1920. The illustration shows the text and the music of the Icelandic National Anthem bordered by Mt. Hekla volcano, the Geysir hot spring, and the streaming rays of the Yule sun, Jólasólin, behind the notes.
You can listen to the Icelandic National Anthem on this page.