Create an advice wall/book/collection. Ask lots of older married couples for tips and thoughts helpful throughout marriage. Record them all. Every anniversary, read through them and see the new purposes and relevance they hold in your marriage.
Topper to cut and minis to serve. this idea is mindblowing :-) What about vintage decorated mini-cakes instead of cupcakes? As long as there's enough for everyone. Put cupcakes on table around cake & mini-cakes? Yep loving that idea!