Sci-fi and historical MOC's are much more common than City themed MOC's nowadays. Here is a very good example of a nice city building. LEGO fan and flickr.com user lisqr who is well known for his great creation like Metro infinity and micro-scale Minas Trith shared this outstanding modern apartment MOC in his photo-stream. The builder used so many shades of blue that I could not say for sure how many. The design of this building is so impressive that  there is almost no plain wall section or symmetry on this but still it looks great.

Hoang Dang built a beautiful fishing ship to pay tribute to the crew of the Vietnamese fishing boat which was sunk by Chinese patrol. This is a moc built with unorthodox techniques and good intentions. My first reaction was 'Best MOC ever!' when I just saw this. Very well done Hoang Dang, brick on!