What are the activities for teaching creativity in problem solving ?

Out of box thinking, viewing problem from multiple angles, critical thinking, step back and holistic thinking

Well, there are quite lot of doors to open an answer for this question.

1. First touch is to start teach how to balance Divergent and Convergent thinking.
2. Ask Problems as questions like rephrase the problems with challenges as open ended questions with multple possibilities for easier solutions.
3. Focus on "Yes, and" rather than "No, but" because "Yes, and" encourages people to come forward with maximum outcome to keys for Locked door.
4. Clarify - Explore the vision and Identify the Goal and start gathering Informations. Formulate Questions that will generate solutions.
5. Select a reasonably Practicable Solution for achieving the Goal.

If you stand in the way of the problem, make mistakes, until all the flaws are eliminated, only then will you find the right way.