Do you sew at all? Or know someone who does? If you do here's what you can do:
Take the scarf to your sewing machine and decide how long you want your scarf to be. Use thread that is the same color as the scarf so the line doesn't show so obvious. Sew across the scarf back and forth a couple of times on BOTH ends. You'd do this to keep the scarf from unraveling when you cut it. Cut it close to where you've sewn but NOT TOO close.
After you've decided how long you want your scarf to be and you've sewed across where you want to cut, go ahead and cut the scarf below where you've sewn, remember, close but not too close to the sewing line.
You'll need to hide where you've cut and sewn so you'll have to add some tassels. You will need some yarn for the tassels that will complement the scarf. If you don't know how to make tassels, don't worry, it's very easy. Here is link that can show you how. http://www.youtube.com/watch?v=wMcWVUwgNRQ
You'll want to make enough tassels to go across the part of the scarf where you've cut and sewn to hide the rough edges.
I hope this helps. :)