Titled 'Non Omnis Moriar'. I spotted this series at Sztuka Fabryka's Flickr pages, I'm glad to see they can be had at 100 Artworks.

This is so cool because it shows the connection between Street-art and Mail-art. Also, it's innovative: it goes way beyond the expected "urban" cliché of Street-art, as it is about a disappearing rural tradition, folklore and folk-art (via Sztuka Fabryka's Flickr Pages)