This has been a cooperative, across miles and years project!
Concepts based on Scripture, especially Romans 5, and also Philippians 2, Ephesians 2, Zechariah 3, various pasages in the letters of James and Peter.
Specific Christmas tree concept, The Cross is God's Christmas Tree, "By Dr. J. Vernon McGee © Thru the Bible Radio Network, www.ttb.org." Currently (12/24/2014) this is available as a free download or purchasable booklet at ttb.org
Follow link to the links under Resources to Electronic Booklets.
Animation by Boom - THANK YOU!