Can you share your favorite brain warm up exercises? Especially some that will work with non-designers.
To post some examples myself:
Circles - as demonstrated by Tim Brown at TED. A paper is pre-filled with ~50 empty circles, and distributed to the participants. Participants should transform as many of those as possible into objects (fishbowl, wheel, glasses) in a short amount of time.
Different uses - pick an object and let everyone come up with possible uses for it, quantity over quality. For example, if the object is a scotch tape, one could technically create a hat from it. Or if it's a CD one could use them as flashy earrings.