[snewe]

Great idea, but if you don't use instagram (i.e. share your photos with the world) there is one alternative that I could find in 5 minutes of Googling: shoot it!

http://www.shootit.com/

They appears to send it from the nearest country you are in.

[jerrya]

I don't think so. Their play is on speed and reduced postage, not on coolness of trip through the mail systems of the world:

From their faq:

"How can you deliver a card in Western Europe that fast? shoot it! has established an international distributed print and mail network. This means your card will print and mail the next business day from the country closest to your recipient’s address. This is how we eliminate the need for international postage and long transit times. Postcards destined to North America print and mail from the U.S. Soon, you will be able to send shoot it! postcards to Japan and South America. But again, you can send postcards "from" anywhere day one! "