Here's what we know: more than 90 percent of kids want a valentine for their grandparents. Here's what we suspect: more than 90 percent of grandparents love nothing more than their grandchildren's faces. Merge that data and you get this valentine, a wide-eyed favorite for all ages.
Fold the card stock in half and draw a heart shape with one side along the fold to form a hinge (we used a heart-shaped cookie cutter for a pattern). Cut out the heart, keeping the hinge intact.
Measure the distance between the eyes on your photocopy. Use a pencil to mark that distance on the top heart and punch out the eyeholes with a hole punch.
Cut the photocopy to fit inside the card and glue or tape it in place, lining up the eyes with the eyeholes. Write "Peekaboo!" on the front of the card, and inside, write "I love you" and any message you like.