Nathan Shedroff:

Creativity is often thought of in terms of artistic expression or hobbies, while productivity is most commonly associated with work and value creation. In truth, there is no difference as each set of activities involves the creation of something. Those who identify primarily with the word creativity tend to abhor structure and look upon work as a limiting factor to their self-expression. Conversely, those more comfortable with the term productivity tend to regard it as an efficient and valuable endeavor and are suspicious of "creative types"....The truth is that both groups are invovled in the same activity, whether they perceive it or not.

From Experience Design 1.