Op Art Cubes. Decorate them as 2D designs & see how they appear to change when folded into boxes. Photograph then from different angles - then put the photographs together to make an image that is altogether different than either of the previous manifestations!
Although learning will be the biggest part in a classroom, but I will also require my students to follow rules. I believe that showing respect for one another is very important. They will also be taught to respect myself as the teacher, and have manners.