I am editing my post because my comments were off-topic. You asked for patterns and not for opinions regarding your choice. I made a comment addressing criticisms made about your choice and after giving it some thought feel it was not appropriate because it is not germane to your original request. In light of how swiftly threads that even TOUCH on religious issues get out of hand and snarky, I am choosing to edit my post accordingly.
With regard to your original request, I wish I had patterns to help, but all I can offer is support.
PS. I would love to see a picture of the finished tree skirt!