ksburn,
No personal experience with the company or any affiliation with them but I have seen lots of positive posts about "Big Worm Graphix" (bigwormgraphix.com). They're in Texas, fwiw. Lots of nice photos on the site (even the non-Mustang vehciles).
You can also run a search on StangNet (and on other forums, if you like) to see if there are any posts that will give you more info.
HTH,
Chris