The first few anniversaries are easy. You're still figuring each other out, still finding new things to celebrate. Somewhere around year five or six, the well starts to run dry — and "flowers and dinner" starts to feel less like a tradition and more like a default setting.
If you're in that stretch, here's a way out of it.
Go back to the beginning, on purpose
Name a star after the date you met, or the place it happened, and write a message that only the two of you would fully understand. At Galaxiana, that takes about as long as choosing a restaurant — and unlike the restaurant, it's still there on your next anniversary, and the one after that. From $34.99.
Recreate the first date, badly if needed
Go back to the same place. Order the same thing, even if it's changed. Half the fun is noticing what's different — about the place, and about the two of you.
Write down what's changed
Not what stayed the same — that part's easy to say. Write down the ways you've actually changed each other, the habits you've picked up from one another, the version of yourself you wouldn't exist without them. It's harder to write than it sounds, and worth far more than it costs.
Whatever you choose, the goal is the same: prove that, after all this time, you're still paying attention. A star with both your names on it is one fairly direct way to do that.