Consider getting personalized stamps with your picture on it or a color which will be incorporated into the wedding. If you are getting married during the holidays, maybe a pointsettia or snowflakes. Keep in mind that you should always have your final proof weighed so that you know how much postage you should include.
Another smart tip is to use "forever" stamps on your RSVP envelopes so that if postage changes, your guests are covered.
Danielle @ PARADISE