Yesterday I shared my experience at Bell's with my collegues!
I think I forgot to mention a great book called "Being Creative" by Chaz Pugliese (one of the teachers of creativity in the classroom) This book contains 3 parts:
Part A - an introduction to being creative
Part B - about 120 creative exercises on 3 levels (fantastic to have in your school bag!)
Part C - ways to evaluate your students and yourself in a creative way
This book is a must have!