I have requests to do Jesse Tree symbols but after checking out what's available online, I have found that there are already many good free resources available. I particularly recommend this one which has very good quality artwork:
http://www.eriercd.org/jessetree.htm
The images below are linked from the website above.
(Illustrations by Carolyn Pikoulas and text by Anne-Marie Welsh for Faith magazine, published by the Diocese of Erie)