Here are a few of my favorite picks because they are easy to learn and lots of fun for two players: Phase 10, Mille Bornes, and Fluxx.
Choose a physical archival print or digital file to DIY.
Here in the Bay Area 3 Fish Studios offers beautiful and affordable linocuts and poster prints.
They do, and they keep it watered, and eventually it sprouts.
Since this is an anniversary gift, try to choose subject matter that has personal meaning to your relationship.