I have not found a pattern, but I found a beautiful drawing (and I believe that it's free):
http://clipart-library.com/clipart/qcBG6x8c5.htmWith little time and patience, I think you can create a nice pattern yourself, because the drawing is very simple.
If you have any problem, just post it on here, there are a lot of knowledge people on this blog will help you out.
HJones.