I actually made up my first Flourish (not sprins fans ect) It was a Triangle which colapses and lands on a fan then flips off the fan into your hand. I couldnt stop doing it for about a week! The first Flourish DVD i got was Dangerous, and is still the only one i have! Actually i only got it last week, im working in Sybil in the rain down and symphony, they looking good.
My first flourish, I guess, was the Charlier cut.
But if you mean the more fancy sort of flourishes, then it is the Flash Drei with Impossible Stack Close from the Xtreme Beginnerz DVD. Back then I thought it was impossible... A short while after that I met the Trilogy .