The hippest thing you can do is not play at all. Just listen.
The jazz musician's function is to feel.
You could make your fingers reproduce exactly what you felt, if you really worked at it. I achieved it, not only spending a lot of time at the keyboard but finding ways I could make my fingers reproduce my deepest feelings. It meant, when you hit a note with a finger, you sank into that note all the way to the bottom of the keyboard until it went pow! Right?
It's not instant composing; it's not following any kind of a formula. All you do is hear music in your head and reproduce it.
Dave Frank is one of the few people that can REALLY play!