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I think you can do that on seventeen.com
http://beauty.ivillage.com/0,,9jlxfdd5,00.html 
This one works, I've used it. Just make sure you shrink your picture to the size of the example and save it as a .jpg file. Just mess around with the lengths, and colours. Be sure to change the lengths and widths of the style so you can see exactly what it would look like.
You dont even have to sign up to use it, its awesome.
yeah yeah - this one is awesome - free - and you upload a picture of yourself so you'll really know what it will look like - tons of different hair cuts and colors and even makeup and nails and glasses - virtualmakeover.com - here's one of me as a librarian 






Free websites to see you with hair color?
does anyone know any free websites I can use to see how I would look with red hair a site that I can upload my picture on ?