Have you ever heard of Keri Smith? You might, she "Wrecks Journals" and she encourages people to do so, too. She triggers your creativity, and if you hesitate to go out of the box, she will encourage and coach you to try it.
If you don't want to use a journal, you can use postcards, like the postcard book "Everything is Connected"
And here - of course - is the link with Postcrossing!
One day - february 6, 2015 - I started a chain letter to my friend maleko in Hawaii.
When he received the postcard he wondered where the card might go, and with a subtle note he made sure that the card would find it's way around the world, back to me.