I love stuff like this. There's a French artist named Vermibus who steals fashion ads then paints over them with solvent to create these creepy portraits:
Really cool stuff. I'm guessing the locks are relatively simple and easy to make keys for? Just wonder how they've managed to make them for so many cities. Need to get back into doing more art, haven't even drawn anything in a long ass time.
Thanks! The locks are all pretty varied - some keys you can get in speciality hardware stores, others you need welding skills to make from scratch. Jordan has published more info on doing this yourself at http://publicadcampaign.com/