On a recent treasure hunt through antique stores I found a couple of very old music books. One was published in 1902 and the other about 1969. I love the yellowed edges, especially in the older book, and the notations from past music directors.
These books didn't contain many Christmas hymns, but this page of "The Glad Bells" is quite seasonal. The page was a perfect fit for a 5x7 mat with a 4x6 opening. Behind the music is a card stock blank for a personal note. I colored "Willow with a Lantern" in Copics and 3d mounted her image on the music. Just a few simple pearls around each corner and I have another mailable-frameable card for Christmas.