I was so delighted to take SPD goodies from my stash and come up with faux washi tape for the back of an envelope to add a little extra love to happy mail.
I just tore a couple post-it notes to get the jagged edges and post in place as my masks. Then I just stamped this border from Build-A-BackgroundBasics then stamped on top with this sentiment from HappyMail. So easy.