We could do this with out Frida Kahlo self-portraits--make them "selfies"! Fun, contemporary back-to-school lesson! Have your students draw "selfies" and describe their summer via text message prompts. Makes for a great bulletin board display!
DIY Woven Friendship Bracelet Using a Circular Cardboard Loom. Very easy, cool jewelry craft for kids weaving a seven strand friendship bracelet. Tutorial from Michael Ann Made here. This might be a good summer craft for the older kids.