For an anniversary
The minute it began.
Paper, cotton, leather — and then twenty-odd years with nothing assigned.
Pick the minute it happened, put their name on it, sign it from yours. From $9.99, and $19.99 for the plan that adds the certificate.
Why this one works
The traditional list runs out of ideas quickly, and every year after that is improvised. A minute is the same present every time and never the same twice, because the story on it can be written new.
It also does something the flowers do not: it comes round. Every year, on that minute, the page says it out loud, wherever in the world it is being read.
For the couple who say they want nothing, this is close enough to nothing to be accepted, and specific enough to be kept.