Have a Ball Marriage Jar
I designed this Have a Ball Marriage Jar* for a friend who just got married. I got the idea for this way back in 1993 — someone (sly and wise I now see) told me when I got married that I should put a penny in a jar every time we kissed the first year, and if I took a penny out every time we did it after that we'd never empty the jar. Ha! The coolest and funnest wedding present ever.
*The jar comes empty – you'll have to fill it up with your own love.