One of my favorite activities to reinforce creativity is to give the kids some kind of shape-a circle, a squiggle, a straight line and ask them to incorporate that shape into creating some sort of design. For example-a circle could be a wheel on a car, a snowman head, a sun, etc. The first shape I give them is a squiggle because 85% of the class will turn it into a snake. And while I make it very clear, there's nothing wrong with a snake, next time I want them to try to come up with something no one else thought of, it becomes a lesson on originality. It's also very telling to me who has an innate creativity. Here are some of what they came up with on the 1st try.
a self-portrait (the description later changed to an alien portrait).
a generator (this student is obsessed with anything mechanical)