We have a PressKit with images you can use here: http://tumbleseed.com/presskit/
Thanks; I used the press kit for the background image of the thumbnail, but I like to add a number to the thumbnail so it is easy to tell which episode I'm on (I certainly plan to do more than a few). If there isn't a specific font, I'll find something close; I just figured I'd ask just in case there was.