You ask every kid in the class to make something for their teacher. A drawing. A short story about the field trip. A few sentences about the thing they finally understood this year. You ask the parents to write too, and maybe a couple of former students who had this teacher years ago. Some kids draw the teacher as a superhero. One writes about how they used to hate reading and now they don't.
We collect all of it -- the letters, the crayon drawings, the photos from class parties and field days -- and print it into a hardcover book. When the teacher opens it, they find the whole year in one place, in the handwriting of the kids who lived it. We've been making these books since 2009, and teachers tend to react the same way: they go quiet, they read a page, and then they start crying somewhere around the fourth drawing.
Teachers spend the year being told to be patient, be firm, hit the standards, and they almost never hear what any of it added up to. A teacher appreciation book hands them the answer, on paper, from the people it was for.