The trick to creativity is speed & reduction of time. I realized this trick when I first began doing Toastmasters Table Topics.
Thought it was crazy to be given a random topic, plan out the speech & deliver it on the spot.
I thought it was impossible.
However, some of the greatest speeches I heard in Toastmasters were from Table Topics. They were even better than a lot of the planned speeches.
Less time allows you to write more with the subconscious mind.
Reduction in time & speed are earned though. Need to put in your reps. Or you need to have a spotlight put over you where you have no choice but to execute. Sort of like in Toastmasters when a crowd is waiting to hear your words.