Inside Greetings: Gratitude Mini stamp set by Ink to Paper, a division of Papertrey Ink. Many of us struggle when it comes to filling the space on the inside of our greeting cards. With Inside Greetings, a series of sentiment stamps, we’ve done the work for you! These longer messages in simple fonts take the guesswork out of that task. Gratitude features 3 sweet messages centered on giving thanks, appreciating kindness, and the idea that no act of kindness can be too small.