A canceled family vacation or a compromise of grandma's house instead of a crowded amusement park might yield a pout, a couple of eyerolls, or maybe even a few stomps. That’s understandable.

The artist Beatie Wolfe approached Mothersbaugh to create Postcards for Democracy, a way to support the U.S. Postal Service through handmade postcards. What can you, an everyday lover of democracy, do ...