Teachers often make portfolios of student work, but what about students creating their own? Teaching Mahollitz is a great elementary classroom blog. The teacher emphasized reflection in her classroom, a practice of any good teacher. In their self-reflection, she asked students to compile their own work in a portfolio. They got a choice as to what assignments displayed their best work, and described what they learned in each example.
Look at the example of what the teacher calls “fancy portfolios.” I like that the student was asked to explain how they benefitted from each assignment. It's a good way for students to have choice in the classroom and self-assess their learning.