I participated in this small photo project, along with a bunch of artists on deviantart.com, called "My doors are prettier than yours!" The idea was to photograph 9 doors found on the SAME street of your city and taken during the same day.
Later on, this was developed into a book consisted of a large variety of "doors photos" contributed by different artists, including mine. The book can be purchased online here: http://www.blurb.com/books/795845
Thanks for checking :)