This is what I sent in a tag to the UK - the receiver wished for "something Finnish" and Fazer's chocolate, so I ended up in sending a Moomin kitchen wipe and some different chocolates.
I'd love to participate more in these (tiny) item tags, but the postage in Finland can become really expensive if you want to send something more than just light and flat things...
What about you, do you often swap items other than postcards? What kind of things? And how's the postage in your country?