Gamification is often used to incentivize people into performing small, repetitive tasks. For example, as a Stack Overflow user, I receive 2 reputation points for an accepted edit. I can earn badges by reviewing series of potentially problematic questions, etc. This seems to work fairly well since the user is given a reward for a easily achievable objective.
In contrast to this, what elements are required to incentivize users into performing creative tasks? Unlike with small 'assignments', a creative task bears the risk of not being solved satisfactory, therefore the user risks investing an effort without being rewarded.
Simply offering a higher reward introduces its own set of problems like having to deal with cheating, therefore my question:
How can I incentivize users to perform creative tasks (e.g., creating a new recipe)?