In my 2010 project, Going Postal, I asked for ATCs featuring an interpretation of the theme postage/postal/mail art, using any media. For each 3 entries received, I created a mini-zine which was sent out to participants as a thank you. Each mini-zine featured pics of 3 ATCS plus designs notes from the artists.
There are 10 zines shown in the photo, and there were a couple more before the project ended. All entries have now been collated in a single, larger zine.