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.
Tutorial - site that has a video on using a kumihimo wheel. It also has links for other pages that allow you to design your own patterns and print your own kumihimo disk template (in a range of sizes and string numbers).