A great anniversary print is specific. The more the design points to a single moment only the two of you share, the more it means on the wall a decade later.
Coordinates prints of the exact spot you got engaged (or married) work beautifully in minimalist serif on off-white. Add the date underneath in small caps and nothing else.
A star map of the night you met is a lovely alternative - every constellation was in that exact place, for you, for that hour.
First-dance lyrics printed as a single quiet paragraph in a soft grey feel more intimate than lyrics-as-typography posters. Let the words do the work.