I think cards and crafts with mason jars will never go out of style. I have a new toy! It is a metal die for making a tri-fold mason jar card. It is made by sizzix.
Here is a top view of the card when it is folded and unfolded.
Here you see how I used a band of cardstock to hold the card closed.
And now, the gorgeous possibilities. They are endless! And, it's so fun! The "jar" inside is removable for writing the message or display. You might even make the inside jar in to a book mark.
Additional Photos -- showing outside and inside. You'll see more clearly how the inside "jar" is removable.