When looking for someone to do a "vintage poster" logo, I came across a woman online - http://maryddesign.com/Home_Page.php. I contacted her through her website contact page and she delivered it in PDF, which is what was requested by my printer. I'm sure you can request it in .jpg too, if that's best for you. She was amazing and super SUPER helpful - when we had an emergency with the printer, she totally helped out and gave me her professional advice.
We used the design for the welcome letter and ended up having a banner on vistaprint made with it, as well.
If you like her vintage poster look, definitely contact her and discuss. I also found a bunch of great designers on ETSY who I emailed and asked if they were willing to do custom work for $75 and there were plenty.