I cast on the Stuff cowl last night and am a bit obsessed. I want to keep going to see what the next fiber is going to be. I'm using Wild Stuff and the colour is new - Winterfell. There are many different hand dyed yarns knotted together. When you get to a knot you keep knitting. GASP! My motto is 'no knots in knitting' except when you're knitting with Stuff. Some tails will fall to the right side, some will fall to the wrong side. I leave them where they are. You can sew them in if you want but they are tied really tight and you don't have to worry about them coming apart.