... jour
---
PDF print with your own background in Mac OS X is so easy
1) install PDFtk with MacPorts (http://www.macports.org)
2) install package PDF print with your own background.pkg (see Files)
3) create your own PDF background in Documents/PDF/background.pdf
from Printing interface of any else application PDF > PDF print with your own background
this kind of virtual printer open Preview application but file is stored in Documents/PDF/<year>/<month>