This might work, but I'm not sure.... Figure out how long you want it, sew along that measurement. Cut about 8-10" away from where you stitched and unravel the sts for a fringe, then trim them to the same length. It may not look the same as the other side though, so you may want to do this on both ends so they match. Just make sure whatever excess you cut off is the same so it doesn't leave it too short.
sue- knitting heretic