Every now and then I grab my tripod and a number of ND (Neutral Density) filters and head into the city to take an architecture shot which I then heavily post process in Photoshop. Why the ND filters? Well it enables one to get long wispy clouds with an exposure time in the minutes.
The post processing is to turn the sky dark, highlight the clouds and then dodge and burn the building to produce different emphasis on its architecture.
Enjoy and if you would like a copy on your wall the drop me a line.