The best ceremonies are brief but thoughtful. So if you have left this portion of your wedding to the officiant - don't. There's no need to reinvent the vows - just take this opportunity to add an original element.
Write each other a paragraph, called "words of affirmation", and read/exchange them before your vows. They reflect your love, journey and unique reason/s for committing to your partner. "Words of affirmation" can be funny, romantic, soulful or a mixed bag. This sharing is heartfelt and organic and will be the portion of the ceremony that you, your spouse, and your guests will most fondly recall.