What would you message in a bottle?

I'm not really advocating adding more trash to our waterways, however as a Valentine's day gift this is a sweet idea: message in a bottle. Paper Pastries is selling these kits, which are very cute, but you could easily recreate something similar on your own. Maybe I'll modify this for one of my classes. I've been wanting to add more creative projects into the mix without them being random trips to the craft cabin. This would be a way to have writing a concise message be the focus, but the design and purpose play an intimate role in the meaning, too. And, for those young and naive enough to be romantic still, they could gift it to someone as a real Valentine.