When I had a Brick and Mortar classroom, there were three bulletin boards in my classroom - Hopes and Dreams which align with the Responsive Classroom philosophy, Problem of the Week which is designed to challenge my students to use their knowledge to solve challenging problems, and content area which relate to each of the three levels of mathematics being taught at that point in time. The attached files show some examples of the problems of the week and the rubric I used to grade.
Problem of the Week
Content Area