Moving clouds make for some interesting photos. Long exposures show motion. Blending multiple frames together in post-processing is another option. I did just that with some recent shots taken in St. Peter's Square using onOne's Perfect Photo Suite to do the layer blending and stylization. The video is about 10 minutes. I think it'll be worth your time.

If you like what you see, onOne is running a sweet summer deal on the Perfect Photo Suite now through June 26th 2014.