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Here is a free sig maker at Halo Tracker, if you have an account: http://www.halotracker.com/siggenerator/pickdesign.aspx

Otherwise, you just take a cool screenshot, edit it for size (my sig is 100px x 500px, for example) and put your name and a motto on it if you want. You can even do it in paint. There are free backgrounds all over the web too, and other places where you can generate them.