Ravelry: Lionessknits' Gathering Rainbows. I'm not so keen on the shape but I really like the idea of the rainbow stripes set into a soft grey background. Actually any stripes - could be a progression of just one colour. It would be a good stash buster!
Pattern description from Last-Minute Knitted Gifts: “These leg warmers are cozy and soft and look great under a skirt. Part of the reason I am so happy with them is the yarn combination: a basic worsted-weight merino, Cascade 220, that comes in a huge variety of colors, and a laceweight kid mohair-silk blend, Madil Kid Seta, that keeps the leg warmers from feeling itchy and gives the color more depth.”