To make the card, cut out a 10-inch by 7-inch piece of cardstock and with a ruler and bone folder, score down the center of the cardstock, perpendicular to the 10-inch side. Fold the cardstock in half along the scored line and with scissors, round the edges of each corner of the folded card. The result should be a 7-inch by 5-inch card.
To make the balloon for the front of the card, cut out a 2 1/2-inch circle with a circle cutter. For the "knot" on the balloon, cut a small triangle out of the same color cardstock. With a hot-glue gun, attach the balloon knot and a piece of twine to the back of the circle. Let dry.
With a glue stick, affix the balloon to the front of the card and tack the twine down in a few spots using small dots of hot glue. Let dry.
Print banner template on colored cardstock. Using a ruler and a bone folder, score template on dashed line. Fold cardstock along scored line.
To create each pennant for the banner, use scissors to cut out triangle around each letter. Be sure to cut through both layers of the cardstock. All of the letter pennants should be double-sided and have a fold along the top edge.
With a glue stick, glue the triangles of each pennant together, sandwiching a piece of baker's twine between them, along the fold, and leaving about 1/8 inch between each pennant. "H-A-P-P-Y" should be on one piece of twine and "B-I-R-T-H-D-A-Y" on another.
Center the "H-A-P-P-Y" banner above the "B-I-R-T-H-D-A-Y" banner and gather twine ends together, allowing both banners to swag evenly. Secure with knots on both ends.
On the inside of the card, measure and mark with a pencil one inch in and one inch down from the top left and right corners. With a hot-glue gun, attach knots on the banner to marks in the corners of the card.
To mail or give as a gift, place card in an A7-size envelope.
Colored baker's twine or embroidery floss
Hot-glue gun and hot-glue sticks
This card, created in honor of the American Cancer Society's More Birthdays campaign, offers celebratory greetings with a fanciful flourish.