A rope bracelet - reminds me of making friendship bracelets back in the day. My right second toe used to go numb because I'd hook the end of the bracelet over it, and then knot embroidery floss for HOURS.
Science make an edible DNA model. This could be use in science class when learning about DNA. Student would love this because its a ton of candy and its creative and hands on. Teachers would love this because its an effective teaching method.