Attached Link: http://www.freeserifsoftware.com/index.asp

You can trace the GIF to create an .ai file for the spline modeler. There's a shareware program called Mayura Draw that will allow you to do that, or you can also download a free software package called SerifDraw 4 plus at the link I've attached. The package is free, but they will send you e-mails asking you to upgrade and stuff; maybe one every month or so. It hasn't been annoying to me, and I have a very low tolerance for spam. (They also have other free, older versions of their software with some photo editing stuff and more.) HTH!