Wedding Invite Postage Stamps - Check out more unique Photo Invite Postage Stamps from the wedding postage designer at Artistic Postage. Green And Red Round Thank You Custom Stickers. These elegant custom green and purple thank you stickers are perfect to use as envelope seals for thank you cards. Use them on the outside of a wrapped gift or gift bag. Great for thanking your guests for showing up at your wedding, anniversary, birthday party, graduation, bridal shower, baby shower, Holiday party and any other special occasion.