Peter Turney has a short post (with a link to a post by Terry Tao) on genius, IQ and passion. I agree with him fully. What counts is passion and hard, hard work.
Creativity will come from working passionately in the field – novel approaches will “pop” into your mind (actually, it’s just your brain rewiring with time 
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As to IQ – I think, g factor notwithstanding, that we should be very careful in this regard. I liked Peter’s classification as IQ measuring a shared passion for solving (certain kinds of?) puzzles.
Genius, Sustained Effort, and Passion (Apperceptual)
