This assignment is perfect as a project-based assessment. Students fill out the pie with memories from their childhood, using the preterite and the imperfect. The "wheel" provides a visual for those actions that would be preterite, the "slices" and those that would be imperfect, the "crust".
This is a PDF file and contains an assignment description/teacher information page (with ideas for presentation), the wheel template, and a grading rubric.
This is great for any level class that has at least a basic understanding of preterite and imperfect.