MOO makes neat postcards. You can print them with your own photos or choose from a great selection. Plus, they ship globally! Have a look!
“send a postcard and receive one back from a random postcrosser somewhere in the world!”
Why do some users have more received postcards than sent?
The algorithm behind Postcrossing is complex and while in some cases it might seem unbalanced, in the long run it does to make everybody to be closely balanced.