Keep Calm and Learn the Objective poster. These signs come in six different colors and can easily be printed out and framed (using the glass of the frame as a dry erase, easy-to-update surface) or enlarged in order create a poster. They could also be given to students to place in the sleeve in their binder to keep track of their own daily objective.
I have enlarged the one in my classroom to poster size, laminated it, and have placed a border around it. I write my daily objective on it using a Vis-A-Vis marker and consistently get comments from students as well as from fellow teachers.