Here is another card that I saw and had to make. It a box card.
Here is the front view.
from the side view
from the top.
I made a svg file for the card. It has three main pieces the back and the front are the same size I folded both sides 1 1/2 inches in on both. I added the colored paper square on the back, the heart cut out on the front and the 2 sides on the front the middle one I folded 3/4 inch on both sides. to put together I taped the middle piece inside the back piece and the top piece to the back with the colored paper on the out side.
Here is 2 more cards that I made