The Art House Co-Op has done it again. They are having this free swap. Actually, they are having quite a few different things go on right now that are free. The one I'm interested in is the Note Swap. it's quick and easy. I'm copying what they have stated about their swap, it's better than anything I could come up with.
The Note Swap
Trade handwritten notes across the globe
"The Note Swap is a worldwide exchange of handwritten letters, contributed by a thousand creative people just like you. Join our community to swap surprises in the mail and take part in an experiment designed to make a stranger's day. Scribble down a love note, a short story, a recipe, a memory, a joke or a secret — your letter could take any form. Simply mail your note to us along with a self-addressed, stamped envelope. We'll make the swap and send you another participant's letter in return. Waiting for the mail can be the best part of your day..."
On line they have examples and more in the way of an explanation. You can also get to the other swaps going on. I've included a quick link - just click on either the underlined "Note Swap" above or here.