I think there's deinitely a lot more to creativity than just technique.
I've always thought being creative is about having the ability to accurately produce a wide variety of shots. I think imagination is interlinked with this as it is needed to decide the best shot for the situation.
For example an uncreative player might have great technique but might see every shot as a lob shot. I think a creative player is a 'thinking' player they don't just hit shots because thats what they did last time, they analyse the situation, they visualise the shots they could hit and use this to aid shot selection. Having decided on the shot they want to play they can then produce the shot that was in their minds eye. They might not have perfect tecnique but they need a consistant execution, so good technique obviously helps. I also think a lot of attention has to be paid to the feels during execution and watching exactly the path of the ball. All this feedback can be used to bridge the gap between visualisation, execution and the result.