Martha Stewart Living has a great project post on making your own custom knitting needles.While hardcore knitters might scoff at the idea (stainless steel built for speed, bay-beee!), I think this would be an awesome project to do with kids. The tools are pretty safe, with the exception of the epoxy to attach the button needle stops (you do that part, K?), and you get to paint the needles with acrylic paints before sealing with butchers wax, so I can imagine all sorts of fun kid art decorating these needles. Try a 1/4" dowel and worsted yarn for a start-to-finish scarf kit.