DIY Leftovers: Sweashirt Necklace, Sweatshirt Headband
Trim excess fabric along the seam with a good pair of scissors. Trim down either side of the collar to your desired length. Take some sew on gems - or buttons, or beads, or a combination of everything - and sew/hot glue them to the collar. Measure two long pieces of silk or grosgrain ribbon, sew/hot glue each piece onto either side.
More info about this project...source: http://www.studs-and-pearls.com/2011/02/diy-leftovers-sweashirt-necklace.html