I would like to suggest 15 different individually wrapped gifts of crystal, each one somehow representing each year. They do not have to be expensive just represent each specific year. Present them in order, SLOWLY like 1st one is a crystal wedding cake or represents where you went on your honeymoon......crystal babies for years the kids where born, crystal house for the year you bought it...etc.That dinner & a movie, bubble bath, foot massage/back massage, clean house with no kids & a new silk robe to slither into after bubble bath...