You could try a couple of friends who do siggy's. Send a pm to 3spartans00 (aka PupsiK who did my siggys's), try also Sorceress92 (a good friend). I know that 3spartans00 does charge for his work (in-game stuff), not sure if he's still doing them as he was gonna quit, but you can give him a try !!
Other than these, you can do a search for siggy makers (top of this page, next to groups), I know there are a few threads relating to siggys, so you should find one ok !!
Hope this helps !!
Grateful thanks to PupsiK for the awesome sigs !!