I don't think it's going to happen with Fair Isle. I did do a hat with it, but I made it a little bigger than normal because it didn't stretch. I did see a slipper pattern in a sock book using Fair Isle. It was knit with all wool and then felted. The slippers looked like boots with a zipper on the front. I've seen other patterns like the loafer type father's slippers from the 50's. Here's a no pattern tutorial for mittens. Fair Isle is supposed to make them warmer for cold climates. Also, my Fair Isle hat.