This I took in Copenhagen. I had to kill half an hour in the middle of the day, and sat down by this lake in the middle of the city. I put on a 10 stop filter and a polarizer and started playing around with it. The fountains turns around ever so slowly, but with a 10 stop filter it starts doing funny things. This is an HDR made from 5 shots. My 10 stop filter has a pretty bad colorcast, so I have had to work a lot on the colors.
BTW: Never screw two filters together – these are still stuck, and I have had to buy a new 10 stop filter.