I just got Flow last night (I got it from the Astonishment Project and not Ellusionist because they had that 1 day delay...) and I just finished watching the bonus effects.
There are three total bonus effect, the first and second a coin through bottle effects (kinda), and the third one, called "Snow Flow", is an effect where water turns to ice in the spectators hands. They are very different from the method and performance of flow, but pretty cool anyways. I wouldn't use them personally, but they are kinda like Stop was to Control. Just extra ideas and concepts to think about.
By the way, Flow's method completely caught me off guard, it's pretty genius.