You can easily make a Valentine's Day card, either by hand or on your computer. Get some heavy 8 by 10 inch card stock in a color you like. For example, you can choose white, red or pink to match the colors of Valentine's Day.
To make the card on your computer, create an image that's 8 inches tall by 10 inches wide in your image processor. Divide the image in half with a vertical line at the center. Create the front of the card on the right side of the image. Write a message such as "Happy Valentine's Day," being sure to leave a space for a 3 by 5 inch photo. Create another 8 by 10 inch image file for the inside of the card. Type your personal message on the right side of the image. Print the first image on one side of the card stock. Then flip the card stock over and print the second image file on the reverse side.
Attach a printed 3 by 5 inch photo to the front of the card with acid-free adhesive. To create this Valentine's Day card by hand, simply fold the card stock in half lengthwise. Attach the photo to the front of the card and write your Valentine's Day greeting and personal message in brightly colored permanent marker.