Looks just like an ordinary card made out of construction paper, right?
BUT, when you open it....
(love how the instructions were stated on the card cover)
You get a heart!
Pretty cool, huh?
Directions for making the card (also known as a peek and pull book) can be found here.
By the way, I used 12"x6" construction paper for this to get a good size for the card.
This is actually from Teacher Treasures. I've attended some of Mary Peterson's workshops and have also bought some of her books. Very useful stuff! I highly recommend signing up for her mailing list to get access to her freebie page (changes every month) which is where I got this idea from. :)