Four new USPS stamps in booklets of 20 available for notes, cards and letters of thanks sent to acknowledge a favor, an act of kindness, a job well done or gifts sent for any occasion. Highlighted in gold foil are the words “Thank you” in cursive script and an elegant floral design that swirls through and around the words. Each stamp features one of four background colors: blue gray, deep blue, muted green or soft maroon.