I know everyone and their dog has done a version of the Tree of Life, but it is one I love and enjoy doing over and over. This one was done with gouache and ink on paper. It is inspired by Shaun Tan's The Red Tree but also by the japansese maple in my backyard which has turned lovely shades of orange and deep red. I couldn't wait to get home tonight to finish it up! I'm pretty happy with it, though I think I would do the details of the tree with a finer pen next time.
Below is one I did a few years ago with coloured pencils on black paper.