An advent calendar was my immediate thought when I saw it.
Do you not have those in the US? Basically each window opens onto a Christmas scene, and for kids advent calendars usually have chocolate behind the windows.
If you're American, or if you live somewhere else where Christmas cards are a tradition, it's virtually guaranteed that you'll see a wall mural of received Christmas cards many, many times per year, especially at businesses but also in homes.
Do you not have those in the US? Basically each window opens onto a Christmas scene, and for kids advent calendars usually have chocolate behind the windows.
http://www.google.co.uk/images?q=advent+calendar