Hi, and welcome to the boards.Several people create sigpics. The place to inquire is not here, but the Off Topic forum. In fact, as of the time of your post, there's a sigpic thread going on, and you could add your request there. Or, at another time, start a new thread.
But as the moderators have asked many times, don't ask folks here.
P.S. You may even discover that you have the ability to create sigpics, depending on what software you have. Users have made sigpics even with MS Paint.