- Arrange a surprise proposal with a street caricaturist. Have the caricaturist sketch a picture of the two of you with word bubbles that say, "Will you marry me?" and "Yes!".
- Plan a romantic destination getaway for two. When you're on the plane, use the loudspeaker system (of course, run your plan by the flight attendants first) and propose at 35,000 feet.
- Hire a flash mob to help suprise your sweetheart. If you haven't seen one of these, here's a good one: www.youtube.com/watch?v=_uiAg-cHJvI