The words "I Do" are virtually universal in a wedding ceremony as the affirmation of your bond as husband and wife. But the text and type of wedding vows have changed throughout the years and are as varied today as the couples that make them.
It's perfectly fine to follow the traditions of your faith when choosing your wedding vows, as some religions follow guidelines as to what needs to transpire during this important part of the ceremony. Usually, though, within these rules, is the ability to make choices that express your feelings and personalities during this public declaration of commitment and love. Talk to your officiant about what options are available, remember your officiant is the perfect person for guidance and reference.
When writing your own vows speak from the heart. One of the compelling reasons for writing your vows is to personalize the ceremony, so make your vows a strong reflection of who you are and what you plan to become as a couple.