Choice boards can be used for in-class assignments and seat work, assessments, or extension activities on a topic that you are discussing with your students. Students enjoy the "choice" aspect and teachers are able to see the variety of information (and interests!) kiddos have picked up from the unit that is being taught and covered.
This choice board has been used with a unit on the Civil War, a unit on Wars the US has participated in, and a unit on Important Events in US History. The board is already differentiated based on choice, and most students will "choose" what is in their ability ranges. Students have to have assignments approved by the teacher, so a teacher can also guide students to choose what is in their ability, as well.