I just find: The Happy Mail project.
The idea is that thirteen creatives will exchange letters during twelve months in a year, each month one of them receives and sends a letter to another.
Here your have some.
If someone want to make it! I'm open to make a group and make it!!!
Si alguien quiere hacerlo!! Estoy disponible para crear un grupo!!!
Pictures of: http://thehappymailproject.blogspot.co.uk/