As some of you may already know, I *like* twirling! This image involves only a single twirl layer, combined with the usual radial blur layer.
One "secret" that I have learned since creating this thread is how to get those really vibrant colors: after doing the radial blur bit, go to Enhance and adjust the Levels (either use Auto Levels or do it manually). That will make a dramatic difference in your twirl! If the colors start looking washed out after one of the steps I will again adjust the levels.