This video by Doug Belshaw is a really good summary of Carol Dweck's ideas about how to encourage learners to be enthusiastic and to value the process of learning over the product. Research seems to indicate that if you praise a student for trying hard and making progress (rather than telling them that they are naturally clever or "gifted") he or she will attempt harder things next time and develop a "growth mindset".
It seems to me that, if we want our students to develop the capacity to be more creative, we should be thinking very carefully about what and how we praise them. Praise is important, but not if it encourages them to be stuck in a fixed view of themselves, whether that is positive or negative.
It would be interesting to know how you all feel about this?