I love Pop-Up's and have been making ATC's. So, I thought of meshing two of my favorite things. I made a "Pop-Up ATC."
It's also a tag with an opening at the top to slip in a love note.
Untie the bow to the heart, and it starts opening on its own.
As the heart is opened, the inside heart pops up.
To reveal the full look of the hearts. You can write a small sentiment inside too.