When I first found out about Tara Bliven's Elevated Envelope Project, I was bummed out because the deadline had passed and I couldn't sign up. The Elevated Envelope is a sort of combination pen pal/mail art swap.The Elevated Envelope is an artistic pen pal project designed to bring back the fun of checking the mail. You’ll create a work of art in envelope form, execute it about 10 times, and mail them to 10 people. Those 10 people will do the same, each sending their own creation to you. So, you give 10, you get 10. (Well, 10-ish.)
You can see the entries they got in the first project here. I elected to join the electronic mailing list to be informed when the next round would be. I got a heads up that there will be another project coming. There aren't any details yet, but Turns out the deadline to sign up is this Friday, the 17th. Check out the links in the comments.
Yay, more mail!