Very seldom do I decide to do this and 8 out of 10 times I fail.. I still haven't gotten a hang of shooting these kind of pictures but when I'm working as an extra photographer for an event, I tend to take such chances..
In simple english, these shots are created by keeping the shutter speed slow.. What we also do is not connect the lens to the camera while taking the shot to get in more effect.. And that's why it doesn't always pull off..
But, I'm content with these pictures.. Maybe will post the bloopers some day..
These two aren't motion blur shots.. Just low shutter speed.. Adding it here because I didn't want to do a post for just two pictures..