Choosing a theme for your 25th anniversary vow renewal is a great way to incorporate some fun into the party. One way to commemorate the year that you were married is to throw a retro ceremony; choose the decade in which you were married and incorporate food, music and clothing that was popular in that decade. Or, choose a more elegant theme. The traditional gift for a 25th anniversary is silver, so you could do a silver theme with silver decorations, dress and place settings. Choose a theme that reflects you as a couple. Are you fun and easygoing? Or are you more formal and elegant?