Possibly the easiest way to use up leftovers is to knit a simple stripe hat. For this hat. I gathered up some of the bright red and purple yarns I had on hand in the last bit of a silk tweed yarn I found at the thrift store. I knit a 2 x 2 ribbing to help keep the hat on, then knit thick, chunky stripes to use up the bits of leftover yarn. I knit the ends in as a one along, which you can see a tiny bit. The yarns are a mix of wool, silk, and alpaca blend, and who knows what else. The result is rather bright for my taste, but hopefully someone will find it fun.