One thing I forgot to add to the list is probably one of the best ones I have. I keep a memory book with class pictures of every class. I also keep some of the best lessons I have taught and a (very emptish) journal of memories.
I actually post the class pictures of every class I have had over the last 22 years on my wall. There some of the kids can locate their parents. Weird, Huh?
I also turned my classroom into a rainforest one year. Green net over the ceiling, all the supports became tree trunks and I made branches and leaves all along the edges of the walls at the ceilings. Every fact the students learned, they wrote on a leaf or bug or animal and added to the walls. It was incredible. The class gathered up pennies for the rainforest and it was donated to the Rainforest Alliance and acres of land was purchased in Costa Rica to preserve the rainforest. They collected $400.00 in pennies and that purchased 4 acres. The class that did it? Their kids wanted to know if we were going to do it again. It wasn't just my memory.
Keep a scrap book or something with your memories. It may not seem much now, but after 22 years, it is fantastic.