The Tennessee Valley LEGO Club (TNVLC) builds and displays a life-size Christmas Tree that they display annually to a charity event that benefits East TN Children’s Hospital in Knoxville, TN.
They took the time to build it in Stud.io and create instructions, which they’ve shared out to use freely. It’s a cool project and worth checking out. https://www.tnvlc.org/resources/christmas-tree
So to be fair (and add some context), the idea stemmed from the large number of green play bricks their LUG got from LEGO. Those combined with personal and other LUG parts helped create the tree. However, I’m not sure that would fit in my car! 🙂