I like to close each school year and open the new one with the same bulletin board "Postcards to Future 4th Graders." I put a red, white, and blue U.S. Mail themed border on it.
I use the below pre-writing and postcard template to get my students to reflect on their year and write notes to my future students. They love it, and it makes a great board for open house and the beginning of school.
Document is FULLY EDITABLE to suit your needs. Includes a circle map pre-planning template along with a rough draft area, and postcard templates for the final draft.