My teacher friend taught me a nice trick-and we had permission from the school to do this, not everyone will be able to-we used the same bulletin board backgrounds to begin the year, as to end it. We just covered them with paper to keep the dust off and left them up. Also, I had an aversion to leaving things sitting out, so most of my stuff was put away all year anyway. It was a matter of organizing and putting away new supplies, uncovering the bulletin boards and neatening them, and arranging desks and tables. I always left the tables for last, because I would group them in the middle and use them for a big space to spread out my planning supplies.