Sweet Striped Arm Warmers like these were designed for the older kids, but you can easily convert the crochet pattern for smaller sizes. Worsted weight yarn is worked in rows as the stripes form into a beautiful pattern.
If you can do a gauge swatch, you can make these wristers! You just knit a square piece with a bit of ribbing then sew up the side leaving a hole for your thumb. I need to learn how to knit so that I can do this!