As mentioned here, one of the art projects for the kids this summer is Huichol Yarn Paintings.
The supplies, process, and history are all mentioned in this post. I ended up doing the project with just the youngest who is 7years old. He didn't love this project but I think it was because I waited until the late afternoon to work on it with him. By then he was pretty tired from a long day of playing in the sunshine.
His issue was just impatience, he understood the steps and he liked the finished product. We ended up sticking it to one of the windows in the house.