These gems were made by a colleague of mine who gave me kind permission to offer them on her behalf. She makes semi-personalized invitations for students to attend help sessions outside of class. The kind but firm language as well as the fun images get even reluctant students, even middle school students, jazzed about seeing her for extra help on assignments.
These are easily modify-able to include different images, assignment details, names, etc. They are perfect for reaching out to students to get study support, or finish an incomplete assignment.