Thanks to Alice's comment, I learned about Civilettes. The description reads: "Hand one to the stranger who used his van to push your idiotically gas-less car to the nearest station (true story,) drop one on the desk of the colleague who had your back during that contentious meeting, place one in the tip jar at your local coffee shop (preferably with a dollar bill wrapped around it.) With Civilettes we unashamedly hope to spark a "civil-ution," aided in part by the "Please reuse" printed on the back of each card." Quite right! Thanks Alice!