The Tigerbark Fig is a particularly easy and forgiving ficus. This is a great beginner tree, because it will forgive mistakes, but if you give it what it likes - it will positively thrive.
The Juniper is the number one choice among bonsai buyers, particularly as gifts and beginner trees. It isn't surprising considering that when you think of a bonsai tree, the image that usually springs to mind is of an evergreen tree and of all the evergreen trees, nothing grows as easily as a Juniper.