I ordered some graphic overlays from JRPanel several months ago, which I'll admit were rather simple.
There was a fair bit of back-and-forth with them to get from the files I sent them upfront to something they were able to make me. However, they were quite responsive during the process. I was generally satisfied with my experience, and will likely use them again in the future.
(Of course finding someone that openly admits they'll work with any random schmoe, absent some sort of "business relationship," is hard enough that I didn't really have any other choices dangling in front of me when I gave them a shot.)