I got a book for Christmas called 'Little People in the City' (blog here http://little-people.blogspot.com/ ) that does a similar thing, love this kinda stuff so thought I'd share!
Great link - funny too coz one of our main cities Auckland - in New Zealand is using images like this to promote themselves as the 'Big Little City'. http://www.BigLittleCity.co.nz/
http://www.BigLittleCity.co.nz/